Parallel
Exodus 12:23
Brenton's English Septuagint · Berean Standard Bible
And the Lord shall pass by to smite the Egyptians, and shall see the blood upon the lintel, and upon both the door-posts; and the Lord shall pass by the door, and shall not suffer the destroyer to enter into your houses to smite [you].
When the LORD passes through to strike down the Egyptians, He will see the blood on the top and sides of the doorframe and will pass over that doorway; so He will not allow the destroyer to enter your houses and strike you down.