Numbers 18:15-17

New Century Version

¹⁵ The first one born to any family, whether people or animals, will be offered to the Lord. And that will be yours. But you must make a payment for every firstborn child and every firstborn animal that is unclean. ¹⁶ When they are one month old, you must make a payment for them of two ounces of silver, as set by the Holy Place measure.

¹⁷ “But you must not make a payment for the firstborn ox or sheep or goat. Those animals are holy. Sprinkle their blood on the altar and burn their fat as an offering made by fire. The smell is pleasing to the Lord.