Exodus 12:22-24

Amplified Bible, Classic Edition

²² And you shall take a bunch of hyssop, dip it in the blood in the basin, and touch the lintel above the door and the two side posts with the blood; and none of you shall go out of his house until morning.

²³ For the Lord will pass through to slay the Egyptians; and when He sees the blood upon the lintel and the two side posts, the Lord will pass over the door and will not allow the destroyer to come into your houses to slay you.

²⁴ You shall observe this rite for an ordinance to you and to your sons forever.