Leviticus 22:18-20

¹⁸Speak to Aaron and his sons, and to all the congregation of Israel, and you shall say to them, Any man of the children of Israel, or of the strangers that abide among them in Israel, who shall offer his gifts according to all their confession and according to all their choice, whatever they may bring to the Lord for whole burnt offerings—

¹⁹your free will offerings shall be males without blemish of the herds, or of the sheep, or of the goats.

²⁰They shall not bring to the Lord anything that has a blemish in it, for it shall not be acceptable for you.