Exodus 12:23
For the LORD will pass through to strike the Egyptians; and when he sees the blood on the lintel, and on the two door posts, the LORD will pass over the door, and will not allow the destroyer to come in to your houses to strike you.
World English Bible (Public Domain)
In context
Before · Exodus 12:21–22
21Then Moses called for all the elders of Israel, and said to them, “Draw out, and take lambs according to your families, and kill the Passover. 22You shall take a bunch of hyssop, and dip it in the blood that is in the basin, and strike the lintel and the two door posts with the blood that is in the basin. None of you shall go out of the door of his house until the morning.
23For the LORD will pass through to strike the Egyptians; and when he sees the blood on the lintel, and on the two door posts, the LORD will pass over the door, and will not allow the destroyer to come in to your houses to strike you.