'Voluntarily' in the Bible

No one takes it away from Me, but I lay it down voluntarily. I am authorized and have power to lay it down and to give it up, and I am authorized and have power to take it back. This command I have received from My Father.”

For if I preach voluntarily, I get a reward, but if I am unwilling to do it, I am still entrusted with that obligation.

For I testify, they gave according to their means and beyond their means. They did so voluntarily,

shepherd the flock of God among you, exercising oversight not under compulsion, but voluntarily, according to the will of God; and not for sordid gain, but with eagerness;