Then Amalek [and his people] came and fought with Israel at Rephidim.

So Moses said to 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.”

So Joshua did as Moses said, and fought with Amalek; and Moses, Aaron, and Hur went up to the hilltop.

Now when Moses held up his hand, Israel prevailed, and when he lowered his hand [due to fatigue], Amalek prevailed.

So Joshua overwhelmed and defeated Amalek and his people with the edge of the sword.

Then the Lord said to Moses, “Write this in the book as a memorial and recite it to Joshua, that I will utterly wipe out the memory of Amalek [and his people] from under heaven.”

saying, “The Lord has sworn [an oath]; the Lord will have war against [the people of] Amalek from generation to generation.”