Exodus 12:22

22 Take a bunch of hyssop, dip it in the blood that is in the basin, and touch the lintel and the two doorposts with the blood in the basin. None of you shall go outside the door of your house until morning.

Exodus 12:22 In-Context

20 You shall eat nothing leavened; in all your settlements you shall eat unleavened bread.
21 Then Moses called all the elders of Israel and said to them, "Go, select lambs for your families, and slaughter the passover lamb.
22 Take a bunch of hyssop, dip it in the blood that is in the basin, and touch the lintel and the two doorposts with the blood in the basin. None of you shall go outside the door of your house until morning.
23 For the Lord will pass through to strike down the Egyptians; when he sees the blood on the lintel and on the two doorposts, the Lord will pass over that door and will not allow the destroyer to enter your houses to strike you down.
24 You shall observe this rite as a perpetual ordinance for you and your children.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.