Amalek Scripture - Deuteronomy 25:19

Therefore it shall be, when the LORD thy God hath given thee rest from all thine enemies round about, in the land which the LORD thy God giveth thee [for] an inheritance to possess it, [that] thou shalt blot out the remembrance of Amalek from under heaven; thou shalt not forget [it].

Link: https://bible-history.com/studybible/Deuteronomy/25/