The firstborn of every womb which they present to the Lord, whether human or animal, will be yours. Nevertheless, the firstborn sons you must redeem, ¹  and the firstborn males of unclean animals you must redeem.

And those that must be redeemed you are to redeem when they are a month old, according to your estimation, for five shekels of silver according to the sanctuary shekel (which is twenty gerahs).

But you must not redeem the firstborn of a cow or a sheep or a goat; they are holy. You must splash ¹  their blood on the altar and burn their fat for an offering made by fire for a pleasing aroma to the Lord.