Exodus 17 — The Rock and the Banner

Today’s Passage: Exodus 17

We come now to a chapter with two great scenes in it, and though they look at first like separate stories, they are teaching the same lesson from two directions. In the first scene the people are dying of thirst, and instead of asking their God who split the sea, they turn on Moses and quarrel and demand water, until the whole camp is on the edge of stoning him. God’s answer is astonishing. He tells Moses to strike a rock, and out of the dry stone gushes water enough for a nation, so that the very place is given two hard names, Massah and Meribah, testing and quarreling, a lasting record of how His people met His kindness with doubt. Then, no sooner is their thirst answered than an enemy falls upon them. The Amalekites attack, and the battle rages in the valley, but the fight is strangely tied to something happening on the hill above it, where Moses stands with the staff of God lifted in his hands. As long as his hands are up, Israel prevails; when they sag, the enemy gains, and so Aaron and Hur come and hold the old man’s arms steady until the sun goes down and the victory is won. Read both scenes together and you will see the one truth binding them: whether it is water in the desert or triumph in the valley, the life of God’s people comes down to them from above, and Moses raises his hands at the end and builds an altar with a name that says it all, the LORD is my banner.

As you read, hold this: The same God who gave His people water from the struck rock fought their battle from the hilltop, so that both their life and their victory came down from His hand and not their own.

Exodus 17:1-3 (BSB)

¹ Then the whole congregation of Israel left the Desert of Sin, moving from place to place as the LORD commanded. They camped at Rephidim, but there was no water for the people to drink. ² So the people contended with Moses, “Give us water to drink.” “Why do you contend with me?” Moses replied. “Why do you test the LORD?” ³ But the people thirsted for water there, and they grumbled against Moses: “Why have you brought us out of Egypt—to make us and our children and livestock die of thirst?”

Notice first that they came to Rephidim exactly as the LORD commanded. The cloud led them here; this dry and waterless camp was not a wrong turn but the very place God chose to bring them, and that is worth remembering when you find yourself somewhere hard and cannot see why. The Guide who led them had not forgotten them. But the people do not reason that way. The moment the water runs out, they round on Moses and demand that he give them drink, as though a man could squeeze rivers out of the air, and Moses answers with the question that cuts to the heart of it. Why do you contend with me? Why do you test the LORD? He sees at once that their quarrel with him is only the surface of something deeper and more dangerous, a testing of God Himself.

And hear how their fear twists their memory once again, the same way it did over the bread. They accuse Moses of dragging them out of Egypt only to kill them and their children and their cattle with thirst, as if the whole rescue had been a cruelty. It is a sobering thing to watch. These are the same people who stood on the far shore of the sea and sang, and only weeks later they speak as though God’s deliverance were a plot against their lives. The thirst was real, and I do not make light of it, but see what unbelief does with a real need. Instead of turning the need into a prayer, it turns it into an accusation.

Exodus 17:4-7 (BSB)

⁴ Then Moses cried out to the LORD, “What should I do with these people? A little more and they will stone me!” ⁵ And the LORD said to Moses, “Walk on ahead of the people and take some of the elders of Israel with you. Take along in your hand the staff with which you struck the Nile, and go. ⁶ Behold, I will stand there before you by the rock at Horeb. And when you strike the rock, water will come out of it for the people to drink.” So Moses did this in the sight of the elders of Israel. ⁷ He named the place Massah and Meribah because the Israelites quarreled, and because they tested the LORD, saying, “Is the LORD among us or not?”

Watch what Moses does with the pressure, because it is the right thing and the only thing. He is a hair’s breadth from being stoned, and he does not argue back with the crowd or defend himself. He cries out to the LORD. He takes the whole impossible burden and lays it down before God, which is exactly where a burden that size belongs. And God’s answer is not anger at the people but provision for them. Go on ahead, He tells Moses, take the elders as witnesses, take the same staff that struck the Nile, and strike the rock. Then comes the most tender line of all: Behold, I will stand there before you by the rock. God Himself will be present at the stone. The water does not come because the rock is special or the staff is magic; it comes because the living God is standing there, and where He stands, life flows even out of stone.

And then those two names, pressed like a seal onto the place so it can never be forgotten. Massah and Meribah, testing and quarreling, named for what the people did there. And under it lies the saddest sentence in the whole account, the real question their grumbling was asking: is the LORD among us or not? That was the doubt beneath all the noise. After the plagues and the sea and the manna, they still wondered whether God was truly with them. It is a warning to every heart that has seen God work and then, at the next dry stretch, quietly asks the same thing.

Exodus 17:8-10 (BSB)

⁸ After this, the Amalekites came and attacked the Israelites at Rephidim. ⁹ So Moses said to Joshua, “Choose some of our men and go out to fight the Amalekites. Tomorrow I will stand on the hilltop with the staff of God in my hand.” ¹⁰ Joshua did as Moses had instructed him and fought against the Amalekites, while Moses, Aaron, and Hur went up to the top of the hill.

The water has scarcely stopped flowing when the second trouble arrives, and it comes with teeth. The Amalekites fall upon Israel, striking at a tired nation on the march, and now for the first time this people must fight. Here a new name steps forward, Joshua, who will one day lead Israel into the promised land, sent out now to muster the men and meet the enemy in the valley. But mark how Moses divides the day. He sends Joshua down to the fighting, and he himself climbs the hill with the staff of God in his hand. There are two fronts to this battle from the very start, one where swords ring in the valley and one where an old man’s hands are lifted on the height, and the Bible wants us to see both at once.

Notice, too, that the staff Moses carries up the hill is the same staff that struck the Nile and split the sea and drew water from the rock only hours before. It is not a weapon. It never wounds a single Amalekite. It is a sign, a visible token that the power in this battle does not belong to Israel’s arm but to Israel’s God, and Moses lifts it up over the valley the way you would lift a signal for everyone below to see where their help was coming from. Joshua does the true and necessary work of the sword, and no one should despise it, but the outcome, as we are about to see, is settled higher up than the valley floor.

Exodus 17:11-13 (BSB)

¹¹ As long as Moses held up his hands, Israel prevailed; but when he lowered them, Amalek prevailed. ¹² When Moses’ hands grew heavy, they took a stone and put it under him, and he sat on it. Then Aaron and Hur held his hands up, one on each side, so that his hands remained steady until the sun went down. ¹³ So Joshua overwhelmed Amalek and his army with the sword.

Here is the strange heart of the whole scene, and it is one of the most vivid pictures in the book. As long as Moses held his hands up, Israel prevailed; the moment his hands sank, the enemy gained ground. The tide of a battle fought with real swords by real men rose and fell with the lifting of one old man’s arms on a distant hill. Now we should be careful how we read this, for there was nothing magic in Moses’ hands. His raised arms were a lifting up of the people’s dependence before God, a wordless prayer held out over the valley, and God bound the victory to it so that no one could ever mistake where the triumph came from. When his hands were up, everyone was reminded that the help was above; when they fell, the reminder fell with them.

And then comes the tender and very human detail that I love in this story. Moses grows tired. The arms of a man past eighty cannot stay lifted forever, and they begin to sag, and with them the fortunes of Israel. So Aaron and Hur do a beautiful thing. They roll a stone under him so he can sit, and then they stand on either side and each holds up one of his hands, and between the two of them they keep his arms steady until the sun goes down. There is a whole picture of the life of God’s people in that image. Even Moses, the great man of God, could not hold his hands up alone. He needed brothers beside him to bear him up when his strength gave out, and because they held him, Joshua overcame the enemy with the sword. The victory in the valley was won by the men who never left the hill.

Exodus 17:14-16 (BSB)

¹⁴ Then the LORD said to Moses, “Write this on a scroll as a reminder and recite it to Joshua, because I will utterly blot out the memory of Amalek from under heaven.” ¹⁵ And Moses built an altar and named it The LORD Is My Banner. ¹⁶ “Indeed,” he said, “a hand was lifted up toward the throne of the LORD. The LORD will war against Amalek from generation to generation.”

When the battle is over, God does not let the day simply pass. He commands Moses to write it down on a scroll and to speak it into Joshua’s ears, for the memory of this must be carried forward. There is judgment in His words, that He will utterly blot out the memory of Amalek from under heaven, for Amalek had struck at God’s people without any fear of God, preying on the weak and the weary at the back of the march. But there is comfort in the words too, comfort for Joshua who will one day lead these people into harder fights than this. The God who won the day at Rephidim will keep on warring against His people’s enemies from generation to generation. This victory was not a single lucky morning; it was a promise of how God fights for His own across all the years to come.

And then Moses builds an altar, and the name he gives it gathers up the meaning of the whole chapter. He does not call it “Joshua’s victory” or “the day we fought well.” He calls it The LORD Is My Banner, lifting the glory clean off of human hands and setting it where it belongs. A hand was lifted up toward the throne of the LORD, he says, and that is the truest description of everything that happened here, both the staff over the valley and the whole nation’s dependence lifted toward heaven. The water from the rock and the triumph over Amalek end at the same altar, under the same banner (נֵס) nes, pronounced NACE. Strong's H5251, banner, standard, signal pole. The name Moses gives the altar, Yahweh-Nissi, joins the covenant name of God with this one word, the whole confession folded into a single title. In the ancient world an army raised its banner on the battlefield as the rallying-point for its soldiers, the tall standard they could see above the dust and the chaos and run toward, the sign that told them where their side was and where to gather and fight. It was the visible center of an army’s courage, and to lift the banner was to call the scattered together and give them something to stand under. , confessing the same truth. Their life and their victory came down from above.

So hear what Moses is confessing when he names the altar the LORD is my banner. He is saying that the true standard Israel fought under that day was not a strip of cloth on a pole but the LORD Himself, lifted high over the valley in the raised staff and the raised hands, the One the whole nation was meant to look to and gather around. And it is more than a war-flag; it is a place of gathering for a scattered and frightened people, a signal held up that says, here is your help, come and rally here. Long after this valley, the Scriptures would take up this same image and speak of a root of Jesse who would one day stand as a banner for the peoples, a rallying-point lifted up for all the nations to come and gather to. When you feel scattered and outnumbered by whatever wars against you, lift your eyes to the same banner Moses named. Your help is not in the strength of your own arm, but in the LORD held high above the battle, and He is calling you to run to Him.