15
Everything that opens the womb, of all flesh which they offer to Yahweh, both of man and animal shall be your: 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.