'Free will' in the Bible

then make an offering by fire to the Lord, a burnt offering or a sacrifice to fulfill a special vow, or as a freewill offering or in your appointed times, to make a soothing aroma to the Lord, from the herd or from the flock.

‘You shall present these to the Lord at your appointed times, besides your votive offerings and your freewill offerings, for your burnt offerings and for your grain offerings and for your drink offerings and for your peace offerings.’”