'Free will offering' in the Bible

But if the sacrifice of his oblation be a vow, or a freewill-offering, it shall be eaten on the day that he offereth his sacrifice; and on the morrow that which remaineth of it shall be eaten:

And whosoever offereth a sacrifice of peace-offerings unto Jehovah to accomplish a vow, or for a freewill-offering, of the herd or of the flock, it shall be perfect to be accepted; there shall be no blemish therein.

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