Numbers 18:15 DBY

¹³  The first ripe of everything that is in their land, which they shall bring to Jehovah, shall be thine; every one that is clean in thy house shall eat of it.

¹⁴  Every devoted thing in Israel shall be thine.

¹⁵  Everything that breaketh open the womb of all flesh, which they present to Jehovah, of men or of beasts, shall be thine; nevertheless the firstborn of man shalt thou in any case ransom, and the firstborn of unclean beasts shalt thou ransom.

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.