Exodus 12:22-24

New Catholic Bible

²² Take a bunch of hyssop^[a] and dip it into the blood in the bowl and sprinkle the blood from the bowl on the lintel and the two doorposts. None of you shall go outside until the morning. ²³ The Lord will pass over to strike the Egyptians. He will see the blood on the lintel and on the two doorposts. The Lord will, therefore, pass over the door and will not allow the destroyer to enter into your house to strike anyone there.^[b]

²⁴ “You shall observe this command as a fixed rite for yourselves and your children forever.