'Free will' in the Bible

And will make an offering by fire unto the LORD, a burnt offering, or a sacrifice in performing a vow, or in a freewill offering, or in your solemn feasts, to make a sweet aroma unto the LORD, of the herd, or of the flock:

These things you shall do unto the LORD in your appointed feasts, besides your vows, and your freewill offerings, for your burnt offerings, and for your grain offerings, and for your drink offerings, and for your peace offerings.