Numbers 18:15-17

Complete Jewish Bible

¹⁵ “Everything that comes first out of the womb, of all living things which they offer to Adonai, whether human or animal, will be yours. However, the firstborn of a human being you must redeem, and the firstborn of an unclean beast you are to redeem. ¹⁶ The sum to be paid for redeeming anyone a month old or over is to be five shekels of silver [two ounces], as you value it, using the sanctuary shekel (this is the same as twenty gerahs). ¹⁷ But the firstborn of an ox, sheep or goat you are not to redeem; they are holy — you are to splash their blood against the altar and make their fat go up in smoke as an offering made by fire, as a fragrant aroma for Adonai.