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And it came to pass, when Moses held up his hand, that Israel prevailed: and when he let down his hand, Amalek prevailed. But Moses hands were heavy; and they took a stone, and put it under him, and he sat thereon; and Aaron and Hur stayed up his hands. 17:11
Trivia: In Exodus 19:9, God said all the people would hear his voice when he talked to Moses. In that meeting, how did God say he would manifest himself?