Numbers [In the desert] 18:14-17

¹⁴“Everything devoted in Israel God prevails shall be yours.

¹⁵Everything that opens the womb, of all flesh which they offer to Adonai , both of man and animal shall be yours. Nevertheless, you shall surely redeem the firstborn of man, and you shall redeem the firstborn of unclean animals.

¹⁶You shall redeem those who are to be redeemed of them from a month old, according to your estimation, for five shekels 2 oz; 56.7 g of money, after the shekel of the sanctuary, (the shekel is 0.4oz; 11.34 g; or called twenty gerahs 20/50 of an oz)

¹⁷“But you shall not redeem the firstborn of a cow, or the firstborn of a sheep, or the firstborn of a goat. They are holy. You shall sprinkle their blood on the altar, and shall burn their fat for an offering made by fire, for a pleasant aroma to Adonai .