Thomson(i)
22 and ye shall take a bunch of hyssop and having dipped it in the blood by the door you shall smear the lintel and the two side posts with some of the blood which is at the door; and none of you shall go out of the door of his house until the morning.
23 For the Lord will pass by to smite the Egyptians; and when he shall see the blood on the lintel and on the two side posts, the Lord will pass over that door and will not suffer the destroyer to enter into your houses to smite.