Where it appears

• Exod 12:7They shall take some of the blood, and put it on the two door posts and on the lintel, on the houses in which they shall eat it.
• Exod 12:22You 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; and none of you shall go out of the door of his house until the morning.
• Exod 12:23For Yahweh will pass through to strike the Egyptians; and when he sees the blood on the lintel, and on the two door posts, Yahweh will pass over the door, and will not allow the destroyer to come in to your houses to strike you.