Exodus 17:7-9

Darby Translation

⁷ And he called the name of the place Massah, and Meribah, because of the contention of the children of Israel, and because they had tempted Jehovah, saying, Is Jehovah among us, or not?

⁸ And Amalek came and fought with Israel in Rephidim.

⁹ And Moses said to Joshua, Choose us men, and go out, fight with Amalek; to-morrow I will stand on the top of the hill with the staff of God in my hand.