Exodus:12:12-13
jub@Exodus:12:12 @ For I will pass through the land of Egypt this night and will smite all the firstborn in the land of Egypt, both [among] man and beast; and against all the gods of Egypt I will execute judgments: I [am] the LORD.
jub@Exodus:12:13 @ And this blood shall be to you for a sign upon the houses where ye [are]; and when I see the blood, I will pass over you, and the plague shall not be upon you to destroy [you], when I smite the land of Egypt.