Leviticus 22:17-19
Regulations for Offering Votive and Freewill Offerings
22:17 The Lord spoke to Moses:
22:18 “Speak to Aaron, his sons, and all the Israelites and tell them, ‘When any man from the house of Israel or from the foreigners in Israel presents his offering for any of the votive or freewill offerings which they present to the Lord as a burnt offering,
22:19 if it is to be acceptable for your benefit it must be a flawless male from the cattle, sheep, or goats.