Exodus 17:16

He said, 'For hands were lifted up to the throne of the LORD. The LORD will be at war against the Amalekites from generation to generation.'

(New International Version)

and he said, 'The LORD has sworn; the LORD will have war against Amalek from generation to generation.'

(New American Standard Bible)

For he said, Because the LORD hath sworn that the LORD will have war with Amalek from generation to generation.

(King James Version)