In Exodus 17, there is a battle between the Israelites and the Amalekites. During the battle, what happened when Moses put his hand down?

And if any man's seed of copulation go out from him, then he shall wash all his flesh in water, and be unclean until the even. Leviticus 15:16

When Moses held up his hand, that Israel prevailed: and when he let down his hand, Amalek prevailed. Exodus 17:17

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