Shemot 13:12-14 Orthodox Jewish Bible (OJB)
12 That thou shalt set apart unto Hashem all that openeth the rechem (womb), and every firstling that is born of a behemah which thou hast; hazecharim (the males) shall be Hashem’s.
13 And every firstling of a he-donkey thou shalt redeem with a seh; and if thou wilt not redeem it, then thou shalt break its neck; and kol bechor adam among thy banim shalt thou redeem.
14 And it shall be when thy ben asketh thee in time to come, saying, Mah zot? (What is this?) that thou shalt say unto him, By chozek yad Hashem brought us out from Mitzrayim, from the bais avadim;