Amalek
In the Book of Deuteronomy, Chapter 25, the Lord tells the Israelites to “remember what Amalek did to you on the way as you were coming out of Egypt” that the Amalekites attacked the Israelites from behind and killed the tired and weak. And because of it, the Lord tells the Israelites to “blot out the remembrance of Amalek from beneath heaven. You shall not forget.”