Exodus 17:14, 16
Exodus 17:14 NASB1995
Then the LORD said to Moses, “Write this in a book as a memorial and recite it to Joshua, that I will utterly blot out the memory of Amalek from under heaven.”
Exodus 17:16 NASB1995
and he said, “The LORD has sworn; the LORD will have war against Amalek from generation to generation.”