Exodus 17:8-13 (NKJV)
[8] Now Amalek came and fought with Israel in Rephidim.
[9] And Moses said to Joshua, “Choose us some men and go out, fight with Amalek. Tomorrow I will stand on the top of the hill with the rod of God in my hand.”
[10] So Joshua did as Moses said to him, and fought with Amalek. And Moses, Aaron, and Hur went up to the top of the hill.
[11] And so it was, when Moses held up his hand, that Israel prevailed; and when he let down his hand, Amalek prevailed.
[12] But Moses’ hands became heavy; so they took a stone and put it under him, and he sat on it. And Aaron and Hur supported his hands, one on one side, and the other on the other side; and his hands were steady until the going down of the sun.
[13] So Joshua defeated Amalek and his people with the edge of the sword.
[9] And Moses said to Joshua, “Choose us some men and go out, fight with Amalek. Tomorrow I will stand on the top of the hill with the rod of God in my hand.”
[10] So Joshua did as Moses said to him, and fought with Amalek. And Moses, Aaron, and Hur went up to the top of the hill.
[11] And so it was, when Moses held up his hand, that Israel prevailed; and when he let down his hand, Amalek prevailed.
[12] But Moses’ hands became heavy; so they took a stone and put it under him, and he sat on it. And Aaron and Hur supported his hands, one on one side, and the other on the other side; and his hands were steady until the going down of the sun.
[13] So Joshua defeated Amalek and his people with the edge of the sword.