Exodus 12:21-23 ▼

21 Then Moses called for all the elders of Israel and said to them, “Bring out and take for yourselves lambs according to your families and slaughter the Passover lamb.

22 And you shall take a bunch of hyssop and dip it in the blood which is in the basin, and touch some of the blood that is in the basin to the lintel and the two doorposts; and none of you shall go outside the doorway of his house until morning.

23 And Yahweh will pass through to smite the Egyptians; and He will see the blood on the lintel and on the two doorposts, and Yahweh will pass over the doorway and will not allow the destroyer to come into your houses to smite you.