Exodus 17:7-9

Lexham English Bible

⁷ And he called the name of the place Massah and Meribah because of the quarrel of the Israelites^[a] and because of their testing Yahweh by saying, “Is Yahweh in our midst or not?”

Battle with the Amalekites

⁸ And Amalek came and fought with Israel at Rephidim. ⁹ And Moses said to Joshua, “Choose men for us, and go out, fight against Amalek tomorrow. I will be standing on the top of the hill, and the staff of God will be in my hand.”