Leviticus 21:17

Moreover, blameless priests served the Godhead by offering blameless sacrifices, while those who were blemished and offered blemished sacrifices and whom Moses described in Leviticus were separated from the altar. And who else is the blameless priest offering a blameless sacrifice than the person who holds fast to his confession and fulfills every requirement the account of martyrdom demands? He is the one we have spoken of before.

I know also that not even bodily blemishes in either priests or victims passed without notice, but that it was required by the law that perfect sacrifices must be offered by perfect men—a symbol, I take it, of integrity of soul.