Exodus 12:23

23 When the LORD goes through the land to strike down the Egyptians, he will see the blood on the top and sides of the doorframe and will pass over that doorway, and he will not permit the destroyer to enter your houses and strike you down.

Read Exodus 12:23 Using Other Translations

For the LORD will pass through to smite the Egyptians; and when he seeth the blood upon the lintel, and on the two side posts, the LORD will pass over the door, and will not suffer the destroyer to come in unto your houses to smite you.
For the LORD will pass through to strike the Egyptians, and when he sees the blood on the lintel and on the two doorposts, the LORD will pass over the door and will not allow the destroyer to enter your houses to strike you.
For the LORD will pass through the land to strike down the Egyptians. But when he sees the blood on the top and sides of the doorframe, the LORD will pass over your home. He will not permit his death angel to enter your house and strike you down.