'Free will' in the Bible

No one is taking it from me; I lay it down of my own free will. I have the authority to lay it down, and I have the authority to take it back again. This is what my Father has commanded me."

I can testify that by their own free will they have given to the utmost of their ability, yes, even beyond their ability.

He welcomed my request and eagerly went to visit you by his own free will.