Numbers 18:16 WEB

¹⁴  Everything devoted in Israel shall be yours.

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

¹⁶  Those who are to be redeemed of them from a month old shall you redeem, according to your estimation, for the money of five shekels, after the shekel of the sanctuary (the same is twenty gerahs).

¹⁷  But the firstborn of a cow, or the firstborn of a sheep, or the firstborn of a goat, you shall not redeem; they are holy: you shall sprinkle their blood on the altar, and shall burn their fat for an offering made by fire, for a sweet savor to Yahweh.

¹⁸  The flesh of them shall be your, as the wave-breast and as the right thigh, it shall be yours.