Exodus 12:23-25

King James Version

²³ For the Lord will pass through to smite the Egyptians; and when he seeth the blood upon the lintel, and on the two side posts, the Lord will pass over the door, and will not suffer the destroyer to come in unto your houses to smite you.

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

²⁵ And it shall come to pass, when ye be come to the land which the Lord will give you, according as he hath promised, that ye shall keep this service.