'Free will' in the Bible

And if you offer a sacrifice of peace offerings to Jehovah, you shall offer it of your own free will.

Speak to Aaron and to his sons and to all the sons of Israel, and say to them: Any man of the house of Israel, or of the strangers in Israel, who offers his sacrifices for his vows, for all his free-will offerings, which they will offer to Jehovah for a burnt offering,

And when a man offers a sacrifice of peace offerings to Jehovah to carry out his vow, or a free-will offering in cattle or sheep, it shall be without blemish to be accepted. There shall be no blemish in them.

As to a young bull or a sheep that is deformed or dwarfed, you may offer that for a free-will offering. But for a vow it shall not be accepted.

besides the sabbath of Jehovah, and besides your gifts, and besides all your vows, and besides all your free-will offerings which you give to Jehovah.