Exodus 17:11-12
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.
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