Leviticus 22:17-20

17And the Lord said to Moses,

18“Give Aaron and his sons and all the Israelites these instructions, which apply both to native Israelites and to the foreigners living among you. “If you present a gift as a burnt offering to the Lord, whether it is to fulfill a vow or is a voluntary offering,

19you will be accepted only if your offering is a male animal with no defects. It may be a bull, a ram, or a male goat.

20Do not present an animal with defects, because the Lord will not accept it on your behalf.