Then came Amalek and fought with Israel in Rephidim.

And Moses said unto Joshua, "Choose out men and go fight with Amalek. Tomorrow I will stand on the top of the hill and the rod of God in mine hand."

And when Moses held up his hand, Israel had the better. And when he let his hand down, Amalek had the better.

And Joshua discomfited Amalek and his people with the edge of his sword.

And the LORD said unto Moses, "Write this for a remembrance in a book and tell it unto Joshua, for I will put out the remembrance of Amalek from under heaven."

for he said, "The hand is on the seat of the LORD, that the LORD will have war with Amalek throughout all generations."