Thematic Bible: Consecration of the firstborn

And when thy son asketh thee in time to come, saying, 'What is this?' Thou shalt say unto him, 'With a mighty hand the LORD brought us out of Egypt, out of the house of bondage. And when Pharaoh was loath to let us go, the LORD slew all the firstborn in the land of Egypt: as well the firstborn of men as of beasts. And therefore I sacrifice unto the LORD all the males that open the matrix, but all the firstborn of my children I must redeem.' And this shall be as a token in thine hand, and as a thing hanged up between thine eyes: because the LORD brought us out of Egypt with a mighty hand."