Exodus 17:11-12

English Standard Version

¹¹ Whenever Moses ^(A)held up his hand, Israel prevailed, and whenever he lowered his hand, Amalek prevailed. ¹² But Moses' hands grew weary, so they took a stone and put it under him, and he sat on it, while Aaron and ^(B)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.