Exodus 17:11-13

Revised Standard Version

¹¹ Whenever Moses held up his hand, Israel prevailed; and whenever he lowered his hand, Am′alek prevailed. ¹² But Moses’ hands grew weary; so they took a stone and put it under him, and he sat upon it, and Aaron and Hur held up his hands, one on one side, and the other on the other side; so his hands were steady until the going down of the sun. ¹³ And Joshua mowed down Am′alek and his people with the edge of the sword.