Deuteronomy 25:17-19 - Revenge On The Amalekites
17 Remember that which Amalek did unto thee by the way when ye came forth out of Egypt; 18 how he encountered thee by the way and cut off in thy rear all the worn-out behind thee, thou thyself, being weary and worn, - how he feared not God. 19 Therefore shall it be when Yahweh thy God hath given thee rest from all thine enemies round about in the land which Yahweh thy God is giving unto thee for an inheritance to possess it, then shalt thou wipe out the remembrance of Amalek from under the heavens, - thou shalt not forget.