'Free will' in the Bible
“If the sacrifice he offers is a vow or a freewill offering, it is to be eaten on the day he presents his sacrifice, and what is left over may be eaten on the next day.
And if you offer a sacrifice of peace offerings to Jehovah, you shall offer it of your own free will.
Speak unto Aaron, and to his sons, and unto all the children of Israel, and say unto them, Whatsoever he be of the house of Israel, or of the strangers in Israel, that will offer his oblation for all his vows, and for all his freewill offerings, which they will offer unto the LORD for a burnt offering;
You shall offer of your own free will a male without blemish, of the cattle, of the sheep, or of the goats.
And whosoever offereth a sacrifice of peace offerings unto the LORD to accomplish his vow, or a freewill offering in beeves or sheep, it shall be perfect to be accepted; there shall be no blemish therein.
Either a bullock or a lamb that hath any thing superfluous or lacking in his parts, that mayest thou offer for a freewill offering; but for a vow it shall not be accepted.