Exodus 17:11-13

Living Bible

¹¹ And as long as Moses held up the rod in his hands, Israel was winning; but whenever he rested his arms at his sides, the soldiers of Amalek were winning. ¹² Moses’ arms finally became too tired to hold up the rod any longer; so Aaron and Hur rolled a stone for him to sit on, and they stood on each side, holding up his hands until sunset. ¹³ As a result, Joshua and his troops crushed the army of Amalek, putting them to the sword.