Then the LORD said to Moses, "Write this for a memorial in the book and recount it in the hearing of Joshua, that I will utterly blot out the remembrance of Amalek from under heaven."
Exodus 17:14
Surrounding context
17:13 So Joshua defeated Amalek and his people with the edge of the sword.
17:14 Then the LORD said to Moses, "Write this for a memorial in the book and recount it in the hearing of Joshua, that I will utterly blot out the remembrance of Amalek from under heaven."
17:15 And Moses built an altar and called its name, The-LORD-Is-My-Banner;