Deuteronomy 25:17 - 25:19
17 “Remember what Amalek did to you along the way when you came out from Egypt, 18 how he met you along the way and attacked among you all the stragglers at your rear, but you were faint and weary; and he did not fear God. 19 Therefore it will be, when Yahweh your God has given you rest from all your surrounding enemies, in the land which Yahweh your God gives you as an inheritance to possess, you shall blot out the memory of Amalek from under heaven; you must not forget.