Exodus 13:14-15 ▼

14 And it has been, when your son asks you hereafter, saying, What [is] this? That you have said to him, By strength of hand YHWH has brought us out from Egypt, from a house of servants;

15 indeed, it comes to pass, when Pharaoh has been pained to send us away, that YHWH slays every firstborn in the land of Egypt, from the firstborn of man even to the firstborn of beast; therefore I am sacrificing to YHWH all opening a womb who [are] males, and I ransom every firstborn of my sons;