21 Then Moses called for all the elders of Israel and said to them, Draw out and take a lamb for yourselves according to your families, and kill the passover.
22 And you shall take a bunch of hyssop and dip in the blood in the bowl, and strike the lintel and the two side posts with the blood in the bowl. And none of you shall go out of the door of his house until the morning.
23 For the LORD will pass through to strike the Egyptians. And when He sees the blood upon the lintel, and on the two side posts, the LORD will pass over the door, and will not allow the destroyer to come into your houses to strike you.