Deuteronomy 25:19

25:19 Therefore it shall be, when Yahweh your God has given you rest from all your enemies round about, in the land which Yahweh your God gives you for an inheritance to possess it, that you shall blot out the memory of Amalek from under the sky; you shall not forget.
-World English Bible

Other Translation

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].
-King James Version