Leviticus 7:16

Be a vow or a voluntary offering. — The vow and the voluntary offering which constitute the second class of peace offerings are both entirely voluntary. The distinction between them, as defined by the canon law, which obtained in the time of Christ, is as follows : — A vow (nçdçr) is an obligation voluntarily imposed upon oneself with the formula, “Behold, I take it upon myself to bring a bullock, &c., for a peace offering.” This undertaking is binding upon the person till he fulfils it. Hence, if the bullock in question dies, or is stolen, or becomes disqualified for a sacrifice, he must bring another. A free-will offering (nedabah) simply pledges voluntarily a certain animal for a peace offering, with the formula, “ Behold, this animal I devote for a peace offering.” Hence, if the animal in question dies, or is stolen, or has otherwise become disqualified for sacrifice, the obligation ceases, since it does not extend beyond the animal thus devoted.

It shall be eaten the same day. — As both these votive offerings were an indirect mode of supplication having respect to future favours, and hence were not a spontaneous expression of pious devotion, they were not so sacred as the former. They were, therefore, allowed to be eaten both on the day of presentation and on the following day.