Exodus 12:23-25

Amplified Bible, Classic Edition

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.

²⁵ When you come to the land which the Lord will give you, as He has promised, you shall keep this service.