Exodus 17:11-12
11Whenever Moses aheld up his hand, Israel prevailed, and whenever he lowered his hand, Amalek prevailed. 12But Moses’ hands grew weary, so they took a stone and put it under him, and he sat on it, while Aaron and bHur 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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