'Free will offering' in the Bible

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.

and will make an offering by fire to Jehovah, a burnt offering or a sacrifice in performing a vow, or in a free-will offering, or in your solemn feasts, to make a sweet savor to Jehovah, from the herd or from the flock,

And you shall keep the Feast of Weeks to Jehovah your God with a measure of a free-will offering of your hand, which you shall give according as Jehovah your God has blessed you.

That which has gone out of your lips you shall keep and perform, even a free-will offering, according as you have vowed to Jehovah your God, which you have promised with your mouth.

and all the silver and gold which you can find in all the province of Babylon, with the free will offering of the people and of the priests, offering willingly for the house of their God in Jerusalem.

And I said to them, You are holy to Jehovah, and the vessels are holy. And the silver and the gold are a free-will offering to Jehovah, the God of your fathers.