Leviticus 22:21-23

When anyone brings from the herd or flock a fellowship offering to the LORD to fulfill a special vow or as a freewill offering, it must be without defect or blemish to be acceptable. Do not offer to the LORD the blind, the injured or the maimed, or anything with warts or festering or running sores. Do not place any of these on the altar as a food offering presented to the LORD. You may, however, present as a freewill offering an ox or a sheep that is deformed or stunted, but it will not be accepted in fulfillment of a vow.