'Free will' in the Bible

and will offer an offering upon the fire unto the LORD, whether it be a burnt offering or a special vow or freewill offering or if it be in your principal feasts to make a sweet savour unto the LORD, of the oxen or of the flock:

These things ye shall do unto the LORD in your feasts: beside your vows and freewill offerings, in your burnt offerings, meat offerings, drink offerings and peace offerings."'