Numbers 18:15-17

Lexham English Bible

¹⁵ All the first offspring of a womb of any creature that they offer to Yahweh, whether human or animal, will be yours; you will surely redeem the firstborn of the human and the unclean firstborn of the animal. ¹⁶ As to their price of redemption, from a one-month-old^[a] you will redeem them according to your proper value, five shekels of silver according to the shekel of the sanctuary, which is twenty gerah. ¹⁷ Only the firstborn of an ox or the firstborn of a sheep or the firstborn of a goat you will not redeem; they are holy. Their blood you will sprinkle over the altar, and their fat you will turn into smoke as an offering made by fire, a fragrance of appeasement for Yahweh.