Exodus 17:14 And the LORD said unto Moses, Write this [for] a memorial in a book, and rehearse [it] in the ears of Joshua: for I will utterly put out the remembrance of Amalek from under heaven.
Exodus 17:16 For he said, Because the LORD hath sworn [that] the LORD [will have] war with Amalek from generation to generation.
Numbers 24:20 And when he looked on Amalek, he took up his parable, and said, Amalek [was] the first of the nations; but his latter end [shall be] that he perish for ever.