Exodus 12:23-25

New Century Version

²³ When the Lord goes through Egypt to kill the Egyptians, he will see the blood on the sides and tops of the doorframes, and he will pass over that house. He will not let the one who brings death come into your houses and kill you.

²⁴ “You must keep this command as a law for you and your descendants from now on. ²⁵ Do this when you go to the land the Lord has promised to give you.