Exodus 17:14,16
And the LORD said to 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.
Torrey's Topical Textbook—AKJV

Deuteronomy 25:19
Therefore it shall be, when the LORD your God has given you rest from all your enemies round about, in the land which the LORD your God gives you for an inheritance to possess it, that you shall blot out the remembrance of Amalek from under heaven; you shall not forget it.
Torrey's Topical Textbook—AKJV