And Moses said unto Joshua, Choose us out men, and go out, fight with Amalek: to morrow I will stand on the top of the hill with the rod of God in mine hand. (17:9)

So Joshua did as Moses had said to him, and fought with Amalek: and Moses, Aaron, and Hur went up to the top of the hill. (17:10)

And it came to pass, when Moses held up his hand, that Israel prevailed: and when he let down his hand, Amalek prevailed. (17:11)

But Moses' hands [were] heavy; and they took a stone, and put [it] under him, and he sat thereon; and Aaron and Hur stayed up his hands, the one on the one side, and the other on the other side; and his hands were steady until the going down of the sun. (17:12)

And Joshua discomfited Amalek and his people with the edge of the sword. (17:13)