Exodus 13:16

13 And every firstling of an ass thou shalt redeem with a lamb; and if thou wilt not redeem it, then thou shalt break his neck: and all the firstborn of man among thy children shalt thou redeem.

14 And it shall be when thy son asketh thee in time to come, saying, What [is] this? that thou shalt say unto him, By strength of hand the LORD brought us out from Egypt, from the house of bondage:

15 And it came to pass, when Pharaoh would hardly let us go, that the LORD slew all the firstborn in the land of Egypt, both the firstborn of man, and the firstborn of beast: therefore I sacrifice to the LORD all that openeth the matrix, being males; but all the firstborn of my children I redeem.

16 And it shall be for a token upon thine hand, and for frontlets between thine eyes: for by strength of hand the LORD brought us forth out of Egypt.

17 And it came to pass, when Pharaoh had let the people go, that God led them not [through] the way of the land of the Philistines, although that [was] near; for God said, Lest peradventure the people repent when they see war, and they return to Egypt:

18 But God led the people about, [through] the way of the wilderness of the Red sea: and the children of Israel went up harnessed out of the land of Egypt.

19 And Moses took the bones of Joseph with him: for he had straitly sworn the children of Israel, saying, God will surely visit you; and ye shall carry up my bones away hence with you.