Numbers 18:15-17

¹⁵Whatever thing cometh first forth of the womb of all flesh, which they offer to the Lord, whether it is of men, either of beasts, it shall be of thy right; so only that thou take price for the first begotten child of man, and that thou make each beast that is unclean to be bought again;

¹⁶whose again-buying shall be after one month, for five shekels of silver, by the weight of the saintuary; a shekel hath twenty halfpence.

¹⁷Forsooth thou shalt not make the first engendered of an ox, and of sheep, and of goat, to be again-bought, for those or they be hallowed to the Lord; only thou shalt pour the blood of those or them upon the altar, and thou shalt burn the inner fatness into sweetest odour to the Lord.