Exodus 17:12
But Moses' hands heavy; and they took a stone, and put under him, and he sat thereon; and Aaron and Hur stayed up his hands, the one on the one side, and the other on the other side; and his hands were steady until the going down of the sun.
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Context
10 So Joshua did as Moses had said to him, and fought with Amalek: and Moses, Aaron, and Hur went up to the top of the hill.
11 And it came to pass, when Moses held up his hand, that Israel prevailed: and when he let down his hand, Amalek prevailed.
12 But Moses' hands heavy; and they took a stone, and put under him, and he sat thereon; and Aaron and Hur stayed up his hands, the one on the one side, and the other on the other side; and his hands were steady until the going down of the sun.
13 And Joshua discomfited Amalek and his people with the edge of the sword.
14 And the Yahuah said unto Moses, Write this a memorial in a book, and rehearse in the ears of Joshua: for I will utterly put out the remembrance of Amalek from under heaven.