Numbers 18:16-18

Darby Translation

¹⁶ And those that are to be ransomed from a month old shalt thou ransom, according to thy valuation, for the money of five shekels, after the shekel of the sanctuary, which is twenty gerahs.

¹⁷ But the firstborn of a cow, or the firstborn of a sheep, or the firstborn of a goat, thou shalt not ransom: they are holy. Thou shalt sprinkle their blood on the altar, and their fat shalt thou burn as an offering by fire for a sweet odour to Jehovah.

¹⁸ And their flesh shall be thine; as the wave-breast and as the right shoulder shall it be thine.