Leviticus 22:18-20

18‘Say this to Aaron, to his sons and to all the people. If any person gives a gift to the Lord,

19he must give a bull, a sheep or a goat. The gift may be for a promise, or to thank God for something or for a friendship offering. The animal must be perfect.

20They must not give any animal that is not perfect. The Lord will not accept that animal.