'Vow' in the Bible

And if the sacrifice of his offering is a vow or free-will offering, in the day of his bringing near his sacrifice it is eaten; and on the morrow also the remnant of it is eaten;

'And when a man bringeth near a sacrifice of peace-offerings to Jehovah, to complete a vow, or for a willing-offering, of the herd or of the flock, it is perfect for a pleasing thing: no blemish is in it;

As to an ox or a sheep enlarged or dwarfed -- a willing-offering ye do make it, but for a vow it is not pleasing.

Speak unto the sons of Israel, and thou hast said unto them, When a man maketh a wonderful vow, by thy valuation the persons are Jehovah's.