Exodus 17:10-13 ▼

10 So Joshua did as Moses said, and fought with Amalek; and Moses, Aaron, and Hur went up to the hilltop.

11 Now when Moses held up his hand, Israel prevailed, and when he lowered his hand [due to fatigue], Amalek prevailed.

12 But Moses’ hands were heavy and he grew tired. So they took a stone and put it under him, and he sat on it. Then Aaron and Hur held up his hands, one on one side and one on the other side; so it was that his hands were steady until the sun set.

13 So Joshua overwhelmed and defeated Amalek and his people with the edge of the sword.