Exodus 17:7-9

Amplified Bible, Classic Edition

⁷ He called the place Massah [proof] and Meribah [contention] because of the faultfinding of the Israelites and because they tempted and tried the patience of the Lord, saying, Is the Lord among us or not?

⁸ Then came Amalek [descendants of Esau] and fought with Israel at Rephidim.

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