Leviticus 27:26-27
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26Only the firstborn among animals, which is made a firstborn to Yahweh, no man shall sanctify it; whether it be ox or sheep, it is Yahweh`s. 27If it be of an unclean animal, then he shall ransom it according to your estimation, and shall add to it the fifth part of it: or if it isn`t redeemed, then it shall be sold according to your estimation.
Leviticus 27:26-27 (WEB)