'Free will offering' in the Bible

And whoever offereth a sacrifice of peace-offerings to the LORD to accomplish his vow, or a free-will-offering in beeves, or sheep, it shall be perfect to be accepted: there shall be in it no blemish.

Either a bullock, or a lamb that hath any thing superfluous or lacking in his parts, that mayest thou offer for a free-will-offering; but for a vow it shall not be accepted.

And will make an offering by fire to the LORD, 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 the LORD, of the herd, or of the flock:

And thou shalt keep the feast of weeks to the LORD thy God with a tribute of a free-will-offering of thy hand, which thou shalt give to the LORD thy God, according as the LORD thy God hath blessed thee:

That which is uttered by thy lips thou shalt keep and perform; even a free-will-offering, according as thou hast vowed to the LORD thy God, which thou hast promised with thy mouth.

And whoever remaineth in any place where he sojourneth, let the men of his place help him with silver, and with gold, and with goods, and with beasts, besides the free-will-offering for the house of God that is in Jerusalem.

And afterward offered the continual burnt-offering, both of the new moons, and of all the set feasts of the LORD that were consecrated, and of every one that willingly offered a free-will-offering to the LORD.

And all the silver and gold that thou canst 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 which is in Jerusalem:

And I said to them, Ye are holy to the LORD; the vessels are holy also; and the silver and the gold are a free-will-offering to the LORD God of your fathers.