Matthew Poole and continuators on Leviticus 7:16

16 But if the sacrifice of his peace-offering be a vow , or a voluntary offering , it shall be eaten the same day that he offereth his sacrifice: and on the morrow also the remainder of it shall be eaten .

Offered in performance of a vow, the man having desired some special favour from God, and vowed the sacrifice to God if he would grant it,

Which a man freely offered to God, in testimony of his Faith and Love to God, without any particular injunction from God, or design of his own special advantage thereby. See Levit. 22. 23. Ezek. 46. 12.

Which was not allowed for the thank-offering. The reason of which difference is to be fetched onely from Gods good pleasure and will, to which he expects our obedience, though we discern not the reason of his appointments.

Marginal references: chap. 19. 5, 6.