'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 feasts, to make a sweet and soothing aroma to the Lord, from the herd or from the flock.

‘You shall present these to the Lord at your appointed times, in addition the offerings you have vowed and your freewill offerings, as your burnt offerings, grain offerings, drink offerings, and as your peace offerings.’”