Exodus 17:7-9

Amplified Bible

⁷He named the place [where this miracle occurred] Massah (test) and ^[a]Meribah (contention) because of the quarreling of the sons of Israel, and because they tested the [patience of the] Lord, saying, “Is the Lord among us, or not?”

Amalek Fought

⁸Then ^[b]Amalek [and his people] came and fought with Israel at Rephidim. ⁹So Moses said to ^[c]Joshua, “Choose men for us and go out, fight against Amalek [and his people]. Tomorrow I will stand on the top of the hill with the staff of God in my hand.”

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Footnotes

Exodus 17:7 A similar incident occurred when the Israelites were in the Wilderness of Zin at Meribah-kadesh (Num 20:8-13; Deut 32:50-52). On that occasion Moses disobeyed God’s specific instruction and paid a terrible price for his action.
Exodus 17:8 These were a group of nomads descended from Amalek, a grandson of Esau, Jacob’s twin brother.
Exodus 17:9 Joshua, leader of the tribe of Ephraim, was one of the great warriors of the OT and was an attendant to and the successor of Moses.