Exodus 12:12-13

and I have passed over through the land of Egypt during this night, and have smitten every first-born in the land of Egypt, from man even unto beast, and on all the gods of Egypt I do judgments; I [am] JEHOVAH. ‘And the blood hath become a sign for you on the houses where ye [are], and I have seen the blood, and have passed over you, and a plague is not on you for destruction in My smiting in the land of Egypt.