Exodus 12

12 "And I will go through the land of Egypt during this night, and I will strike all of the firstborn in the land of Egypt, from human to animal, and I will do punishments among all of the gods of Egypt. I am Yahweh. 13 And the blood will be a sign for you on the houses where you are, and I will see the blood, and I will pass over you, and there will not be a destructive plague among you when I strike the land of Egypt.