Exodus 17:11-13

11 And so it was, when Moses held up his hand, that Israel prevailed; and when he let down his hand, Amalek prevailed.
12 But Moses' hands became heavy; so they took a stone and put it under him, and he sat on it. And Aaron and Hur supported his hands, one on one side, and the other on the other side; and his hands were steady until the going down of the sun.
13 So Joshua defeated Amalek and his people with the edge of the sword.
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