Exodus 17:9-12

Leeser(i) 9 And Moses said unto Joshua, Choose for us men, and go out, fight with Amalek; tomorrow I will stand on the top of the hill with the staff of God in my hand. 10 And Joshua did as Moses had said to him, to fight with Amalek; and Moses, Aaron, and Chur went up to the top of the hill. 11 And it came to pass, when Moses held up his hand, that Israel prevailed: and when he let down his hand, that Amalek prevailed. 12 But when the hands of Moses became heavy, they took a stone, and put it under him, and he sat thereon; and Aaron and Chur 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.