Exodus 12:23-25

Darby Translation

²³ And Jehovah will pass through to smite the Egyptians; and when he sees the blood on the lintel, and on the two door-posts, Jehovah will pass over the door, and will not suffer the destroyer to come into your houses to smite [you].

²⁴ And ye shall observe this as an ordinance for thee and for thy sons for ever.

²⁵ And it shall come to pass, when ye are come into the land that Jehovah will give you, as he has promised, that ye shall keep this service.