Deuteronomy 17:1

Thou shalt not sacrifice unto the Lord, thy God, any bullock or sheep wherein is blemish, or any evil-favoredness; for that is an abomination unto the Lord, thy God. The offering of an imperfect animal as sacrifice, one infected with any of the evils mentioned Leviticus 22:20, is just as much an insult to Jehovah as the erecting of pillars to Asherah and Baal; hence the authorities were to watch carefully over these matters.