Leviticus 22:21

21 When anyone offers a sacrifice of well-being to the Lord, in fulfillment of a vow or as a freewill offering, from the herd or from the flock, to be acceptable it must be perfect; there shall be no blemish in it.

Leviticus 22:21 In-Context

19 to be acceptable in your behalf it shall be a male without blemish, of the cattle or the sheep or the goats.
20 You shall not offer anything that has a blemish, for it will not be acceptable in your behalf.
21 When anyone offers a sacrifice of well-being to the Lord, in fulfillment of a vow or as a freewill offering, from the herd or from the flock, to be acceptable it must be perfect; there shall be no blemish in it.
22 Anything blind, or injured, or maimed, or having a discharge or an itch or scabs—these you shall not offer to the Lord or put any of them on the altar as offerings by fire to the Lord.
23 An ox or a lamb that has a limb too long or too short you may present for a freewill offering; but it will not be accepted for a vow.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.