Exodus 12:12-13

12For aI will pass through the land of Egypt that night, and I will strike all the firstborn in the land of Egypt, both man and beast; and on ball the gods of Egypt I will execute judgments: cI am the Lord. 13 dThe blood shall be a sign for you, on the houses where you are. And when I see the blood, I will pass over you, and no plague will befall you to destroy you, when I strike the land of Egypt.

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