Deuteronomy 25:19 in the World English Bible
Therefore it shall be, when the LORD your God has given you rest from all your enemies all around, in the land which the LORD 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.
Context
18 How he met thee by the way, and smote the hindmost of thee, even all that were feeble behind thee, when thou wast faint and weary; and he feared not God.
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.