Leviticus 1:2

1:2 “Speak to the Israelites and tell them, ‘When someone among you presents an offering to the Lord, you must present your offering from the domesticated animals, either from the herd or from the flock.

Leviticus 22:21

22:21 If a man presents a peace offering sacrifice to the Lord for a special votive offering or for a freewill offering from the herd or the flock, it must be flawless to be acceptable; it must have no flaw.