Genesis 21

Today’s Passage: Genesis 21

For twenty-five years the promise has been hanging in the air of this old couple’s tent, and today, at last, it comes true. You must read this chapter with the long wait behind you, remembering how many times the child has been promised and how many times hope has thinned, because only then can you feel the joy of that opening line: the LORD did for Sarah exactly what He had said, at the very time He had spoken. A hundred-year-old man holds a newborn son. A woman who once laughed a bitter, unbelieving laugh at the tent door now laughs for gladness, and says that everyone who hears will laugh along with her. The child is named Isaac, which means he laughs, so that the very sound of his name will always carry the story of how God turned an old woman’s doubt into song. But the chapter does not stay in the nursery. At Isaac’s weaning feast an old wound reopens, Hagar and Ishmael are sent away into the wilderness of Beersheba, and there, when the water is gone and the mother cannot bear to watch her boy die, God hears the child’s voice and opens her eyes to a well. And at the end Abraham plants a tree by that well of the oath and calls on the name of the LORD, the Everlasting God. Fulfilled promise, honest sorrow, and mercy reaching all the way down to the cast-out: that is the whole shape of this day.

As you read, hold this: At the appointed time God kept His word, and turned old laughter into joy.

Genesis 21:1-7 (BSB)

¹ Now the LORD attended to Sarah as He had said, and the LORD did for Sarah what He had promised. ² So Sarah conceived and bore a son to Abraham in his old age, at the very time God had promised. ³ And Abraham gave the name Isaac to the son Sarah bore to him. ⁴ When his son Isaac was eight days old, Abraham circumcised him, as God had commanded him. ⁵ Abraham was a hundred years old when his son Isaac was born to him. ⁶ Then Sarah said, “God has made me laugh, and everyone who hears of this will laugh with me.” ⁷ She added, “Who would have told Abraham that Sarah would nurse children? Yet I have borne him a son in his old age.”

Read those first two verses slowly, because they are almost too full to take in at a glance. The LORD attended to Sarah as He had said. The LORD did for Sarah what He had promised. At the very time God had promised. Three times over, in a handful of words, the Bible presses the same truth into your hand: God kept His word, and He kept it exactly, and He kept it on time. There was no clever shortcut, no help from Abraham and Sarah’s own scheming as there had been with Hagar. The child simply came, at the appointed hour, because the God who had spoken was faithful to speak it into being. Everything that follows in the rest of Scripture, every later promise you are asked to trust, stands on the reliability shown right here.

And then listen to Sarah. This is the same woman who, back at the tent door, laughed a small hidden laugh of unbelief when she overheard that she would have a son, for it seemed a joke too cruel to hope for. Now she laughs again, but the laughter has completely changed its meaning. God has made me laugh, she says, and everyone who hears will laugh with me. The bitter chuckle of doubt has become the open, ringing laughter of joy, and she cannot keep it to herself, she wants the whole world to laugh along. Who would ever have told Abraham that Sarah would nurse a baby? No one would have dared. And so they name the boy Isaac (יִצְחָק) Yitschaq, pronounced yits-KHAHK. Strong's H3327, he laughs (proper name, Isaac). The name Isaac simply means he laughs, and there may be no name in the whole Bible so weighted with meaning, for laughter runs all the way through his story like a thread. Abraham laughed when he first heard the promise. Sarah laughed behind the tent door in disbelief. And now Sarah laughs a third time, out loud and unashamed, because the impossible thing has actually happened, and she gives that joy to her son as his very name. The wonder of it is how God gathers up every one of those laughs, the doubting ones and the delighted one, and folds them into a single child. He is not embarrassed by the laugh of our weak faith; He answers it, in His own time, with a joy so large that the doubt is swallowed up. So the boy who carries the name he laughs is a walking reminder that our God delights to turn the laughter of unbelief into the laughter of praise. , he laughs, so the joy is stitched right into his name. Every time anyone in that camp calls the child to dinner, they will be saying out loud what God can do with an old woman’s impossible situation. Give thanks for a God who can take the very laugh of our unbelief and turn it, in His own time, into the laugh of praise.

Genesis 21:8-13 (BSB)

⁸ So the child grew and was weaned, and Abraham held a great feast on the day Isaac was weaned. ⁹ But Sarah saw that the son whom Hagar the Egyptian had borne to Abraham was mocking her son, ¹⁰ and she said to Abraham, “Expel the slave woman and her son, for the slave woman’s son will never share in the inheritance with my son Isaac!” ¹¹ Now this matter distressed Abraham greatly because it concerned his son Ishmael. ¹² But God said to Abraham, “Do not be distressed about the boy and your maidservant. Listen to everything that Sarah tells you, for through Isaac your offspring will be reckoned. ¹³ But I will also make a nation of the slave woman’s son, because he is your offspring.”

The feast is a happy one, held on the day the child is weaned, which in that world was a milestone worth celebrating, for a little one had passed safely through the most dangerous years. But into the joy of the day an old sorrow creeps back in. Sarah sees Ishmael mocking her son, and whatever exactly that mocking was, it strikes her as a threat to Isaac’s place, and she demands that Hagar and her boy be put out for good, so that the servant’s son will never share the inheritance. It is a hard, protective, unbending word from a mother, and we should not pretend it is a gentle one. This is a real family fracturing along a real fault line, the kind of grief that has run through households in every age since.

And notice how honestly the Bible tells us Abraham felt: the matter distressed him greatly, because Ishmael was his son too, his own flesh, a boy he had loved and raised for fourteen years. This is no small thing being asked of him. Into that distress God speaks, and He does two things at once. He tells Abraham to listen to Sarah, because the line of promise must run through Isaac and no other, so the household truly must divide. But in the same breath He refuses to let Ishmael be thrown away as worthless: I will also make a nation of the slave woman’s son, because he is your offspring. God does not stop caring for the boy who is not the child of promise. He holds the covenant line firm and gathers up the cast-out son in mercy, both at once. That tells you something steady about the heart of God, that His choosing of one does not mean His forgetting of another.

Genesis 21:14-16 (BSB)

¹⁴ Early in the morning, Abraham got up, took bread and a skin of water, put them on Hagar’s shoulders, and sent her away with the boy. She left and wandered in the Wilderness of Beersheba. ¹⁵ When the water in the skin was gone, she left the boy under one of the bushes. ¹⁶ Then she went off and sat down nearby, about a bowshot away, for she said, “I cannot bear to watch the boy die!” And as she sat nearby, she lifted up her voice and wept.

Here the story slows down and grows very quiet and very sad, and the Bible does not rush us past it. Early in the morning, before the heat, Abraham himself rises and loads bread and a skin of water onto Hagar’s shoulders and sends her out. There is no cruelty in how he does it, only sorrow, an old man doing the hard thing God had told him to do. And then Hagar and her son are alone in the wilderness of Beersheba, and the water runs out. Anyone who has ever stood helpless while someone they love suffers will feel what happens next in their own chest.

She lays the boy under a bush for whatever shade it offers, and then she walks off a little way, about the distance an arrow flies, and sits down, because she cannot bear to watch him die. Hear the whole weight of that. This is a mother at the very end of herself, out of water, out of hope, out of options, unable even to look at her dying child, and she lifts up her voice and weeps. The Bible lets her grief be exactly as large as it is. It does not tidy it up or hurry to the rescue. And that honesty matters, because the God who is about to act is not a God who only shows up where everything is fine. He is a God who draws near to the lowest place, to a weeping woman and a dying boy in a waterless desert, and it is precisely there that heaven is about to speak.

Genesis 21:17-21 (BSB)

¹⁷ Then God heard the voice of the boy, and the angel of God called to Hagar from heaven, “What is wrong, Hagar? Do not be afraid, for God has heard the voice of the boy where he lies. ¹⁸ Get up, lift up the boy, and take him by the hand, for I will make him into a great nation.” ¹⁹ Then God opened her eyes, and she saw a well of water. So she went and filled the skin with water and gave the boy a drink. ²⁰ And God was with the boy, and he grew up and settled in the wilderness and became a great archer. ²¹ And while he was dwelling in the Wilderness of Paran, his mother got a wife for him from the land of Egypt.

Now watch the word that turns the whole scene: God heard (שָׁמַע) shama, pronounced shah-MAH. Strong's H8085, to hear, listen, heed, obey. This is the ordinary Hebrew word for hearing and listening, and it is the very root tucked inside the name Ishmael, which means God hears. Look at how carefully God ties the whole story together with it. Back in chapter sixteen, when Hagar first fled into the desert, God heard her affliction and named her unborn son with this word. Now, years later, when that same son lies dying, God heard the voice of the boy, and the promise buried in his name comes true a second time. Nothing about Hagar’s low standing changed God’s readiness to listen. She was a foreign servant, cast out twice, with no one on earth to plead her case, and still the one ear that mattered was open. That is the quiet comfort folded into a child’s name and repeated here in the wilderness: when you feel most unheard, at the very end of your strength, the God of Hagar and Ishmael is a God who hears, and no cry lifted to Him falls to the ground. . God heard the voice of the boy. Do you remember what that boy’s name means? Years before, at another desert spring, God had told Hagar to name her son Ishmael, God hears, and here, at the very moment it matters most, God does exactly what the name has been promising all along. The mother is weeping a bowshot away, but it is the child’s voice that heaven bends down to catch, and the angel of God calls out of the sky the tenderest words a terrified person could hope for: do not be afraid, for God has heard. He is not far off. He has heard, and He has come.

Then God does two things for her, and both are gifts. First He renews the promise, get up, lift up the boy, take him by the hand, for I will make him a great nation, so that the son she thought she was about to bury has a future after all. And second, God opened her eyes, and she saw a well of water. The well may well have been there all along, but in her grief and panic she could not see it, and God simply opened her eyes to the rescue that was already near. She fills the skin and gives her boy a drink, and the dying scene becomes a living one. And the chapter tells us the sweetest thing of all in a single plain line: God was with the boy. He grew up in the wilderness, became a skilled archer, and in time his mother found him a wife. The cast-out son was not abandoned. The God who hears was with him all his days. Praise the God who hears the voice of a child in a waterless place, and who opens blind and weeping eyes to the well that mercy has already provided.

Genesis 21:22-24 (BSB)

²² At that time Abimelech and Phicol the commander of his army said to Abraham, “God is with you in all that you do. ²³ Now, therefore, swear to me here before God that you will not deal falsely with me or my children or descendants. Show to me and to the country in which you reside the same kindness that I have shown to you.” ²⁴ And Abraham replied, “I swear it.”

The scene shifts now from the wilderness back to the world of neighbors and treaties, and at first it may seem like a lesser matter, but there is something worth seeing here. Abimelech, a local king, comes to Abraham with his army commander, and he opens with a striking admission: God is with you in all that you do. This pagan king has been watching Abraham’s life, and he has drawn the obvious conclusion. The blessing of God on this wandering old man had become visible enough that outsiders could not miss it. There is a witness in that. When God is truly with a person, it tends to show, not in loud claims, but in a life others can see is being kept and prospered by a hand beyond their own.

So Abimelech asks Abraham to swear a treaty of good faith, promising kindness between them and their descendants, the same kindness the king says he has shown Abraham. And Abraham simply answers, I swear it. It is a small, honest moment of two men agreeing to live at peace. But standing where it does, right after the anguish in the desert, it quietly reminds us that God’s care for Abraham was never only about grand promises and dramatic rescues. It reached into the ordinary business of getting along with the neighbors, and there too the blessing of God was plain for all to see.

Genesis 21:25-34 (BSB)

²⁵ But when Abraham complained to Abimelech about a well that Abimelech’s servants had seized, ²⁶ Abimelech replied, “I do not know who has done this. You did not tell me, so I have not heard about it until today.” ²⁷ So Abraham brought sheep and cattle and gave them to Abimelech, and the two men made a covenant. ²⁸ Abraham separated seven ewe lambs from the flock, ²⁹ and Abimelech asked him, “Why have you set apart these seven ewe lambs?” ³⁰ He replied, “You are to accept the seven ewe lambs from my hand as my witness that I dug this well.” ³¹ So that place was called Beersheba, because it was there that the two of them swore an oath. ³² After they had made the covenant at Beersheba, Abimelech and Phicol the commander of his army got up and returned to the land of the Philistines. ³³ And Abraham planted a tamarisk tree in Beersheba, and there he called upon the name of the LORD, the Eternal God. ³⁴ And Abraham resided in the land of the Philistines for a long time.

The treaty is nearly settled, but there is one honest disagreement to clear up first, and it is a very human one: water. In that dry country a well was life itself, and some of Abimelech’s servants had seized a well that Abraham’s people had dug. So Abraham raises the matter plainly, the king pleads that he never knew of it, and the two men set things right in the open, sealing their peace with gifts of sheep and cattle. Then Abraham sets apart seven ewe lambs as a public witness that the well is truly his, and that is how the place gets its name, Beersheba, which means both the well of the oath and the well of seven, the very sound of the place forever recording the day two men swore to deal honestly with each other. Faith does not float above ordinary life; it settles its disputes with truth and lives at peace with its neighbors.

And then, in the last quiet lines of the chapter, Abraham does something beautiful. He plants a tamarisk tree at Beersheba, a slow-growing tree that would outlive him by generations, a living marker in the ground. And there he calls upon the name of the LORD, the Everlasting God (עוֹלָם) olam, pronounced oh-LAHM. Strong's H5769, long duration, antiquity, eternity, forever. Abraham calls on the LORD here as El Olam, the Everlasting God, and olam is the word that carries all the weight of it. It means the far distance of time, the long ago and the long ahead, the age that stretches beyond where our eyes can follow. There is a deep fittingness in Abraham reaching for this particular name at this particular moment. He has just watched God keep, at a hundred years old, a promise first spoken when he was seventy-five. He has learned across those long decades that God’s memory does not fade and God’s timing does not fail. So he names Him the God of olam, the God who was there before the waiting began and will be there long after the tamarisk tree has grown tall. When the promises of such a God feel slow, remember Abraham under his tree: the One who makes them is everlasting, and everlasting patience always outlasts our waiting. . Think of where this old man now stands. The son he waited a quarter century for is finally in his arms. The wilderness has not swallowed anyone. Peace is made with the king. And so Abraham worships, naming God by the name that fits the moment best: the Everlasting God, the One who does not change, who was faithful across all those long years and will be faithful across all the years to come. The tree will stand and the well will remain, but the God he calls upon outlasts them both. That is exactly the right response to a chapter of kept promises, to plant something lasting and to lift up the name of the God who is everlasting.