Deuteronomy 25:17-19 - Revenge On The Amalekites
17 Remember what Amalek did to thee in the way, in your coming forth out of Egypt: 18 That he met thee in the way, and he will smite the rear in thee all the enfeebled behind thee, and thou faint and weary: and he feared not God. 19 And it was in Jehovah thy God giving rest to thee from all thine enemies from round about in the land which Jehovah thy God gave to thee an inheritance to possess it, thou shalt wipe out the remembrance of Amalek from under the heavens; thou shalt not forget