'Free will' in the Bible

"You won't be allowed to eat your tithe of grain, new wine, oil, the firstborn of your herd and flock, your voluntary offerings that you pledged, your free-will offerings, and the works of your hands in your own cities.

Then observe the Festival of Weeks in the presence of the LORD your God by giving your tribute and the freewill offering of your hands in proportion to the manner in which the LORD your God blessed you.