Exodus 17:14-16

21st Century King James Version

¹⁴ And the Lord said unto Moses, “Write this for a memorial in a book, and recount it in the ears of Joshua; for I will utterly put out the remembrance of Amalek from under heaven.”

¹⁵ And Moses built an altar, and called the name of it Jehovahnissi [that is, The Lord my banner];

¹⁶ for he said, “Because the Lord hath sworn that the Lord will have war with Amalek from generation to generation.”