Exodus 17:8-16 - Battle With The Amalekites

⁸ Then came Amalek and fought with Israel in Rephidim. ⁹ 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."

¹⁰ And Joshua did as Moses bade him, and fought with the Amalekites. And Moses, Aaron and Hur went up to the top of the hill. ¹¹ And when Moses held up his hand, Israel had the better. And when he let his hand down, Amalek had the better. ¹² When Moses' hands were weary, they took a stone and put it under him, and he sat down thereon. And Aaron and Hur stayed up his hands, the one on the one side and the other on the other side. And his hands were steady until the sun was down. ¹³ And Joshua discomfited Amalek and his people with the edge of his sword.

¹⁴ 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."

¹⁵ And Moses made an altar and called the name of it Jehovah Nissi, ¹⁶ for he said, "The hand is on the seat of the LORD, that the LORD will have war with Amalek throughout all generations."