Exodus 12:27 WBT

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

²⁶  And it shall come to pass, when your children shall say to you, What mean you by this service?

²⁷  That ye shall say, It [is] the sacrifice of the LORD'S passover, who passed over the houses of the children of Israel in Egypt, when he smote the Egyptians, and delivered our houses. And the people bowed the head and worshiped.

²⁸  And the children of Israel went away, and did as the LORD had commanded Moses and Aaron, so did they.

²⁹  And it came to pass, that at midnight the LORD smote all the first-born in the land of Egypt, from the first-born of Pharaoh that sat on his throne, to the first-born of the captive that [was] in the dungeon; and all the first-born of cattle.