'Free will' in the Bible

The children of Israel brought a freewill-offering unto Jehovah; every man and woman, whose heart made them willing to bring for all the work, which Jehovah had commanded to be made by Moses.

and they received of Moses all the offering which the children of Israel had brought for the work of the service of the sanctuary, wherewith to make it. And they brought yet unto him freewill-offerings every morning.