Exodus 17:9-11

Darby Translation

⁹ And Moses said to Joshua, Choose us men, and go out, fight with Amalek; to-morrow 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 Hur went up to the top of the hill.

¹¹ And it came to pass when Moses raised his hand, that Israel prevailed; and when he let down his hand, Amalek prevailed.