Exodus 12:12-13
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12For I will go through the land of Egypt on that night, and fatally strike all the firstborn in the land of Egypt, from the human firstborn to animals; and against all the gods of Egypt I will execute judgments—I am the Lord. 13The blood shall be a sign for you on the houses where you live; and when I see the blood I will pass over you, and no plague will come upon you to destroy you when I strike the land of Egypt.