Therefore, when the Lord your God will give you rest, and you will have subdued all the surrounding nations, in the land which he has promised to you, you shall delete his name from under heaven. Take care not to forget this.
Other versions
King James Version
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.English Standard Version
Therefore when the LORD your God has given you rest from all your enemies around you, in the land that the LORD your God is giving you for an inheritance to possess, you shall blot out the memory of Amalek from under heaven; you shall not forget.New International Version
When the LORD your God gives you rest from all the enemies around you in the land he is giving you to possess as an inheritance, you shall blot out the memory of Amalek from under heaven. Do not forget!