Ver. 16-22. Our Saviour here showeth the false doctrine which the Pharisees, for their own gain, taught the people concerning oaths. God had commanded that they should fear and serve the Lord their God, and swear by his name, Deuteronomy 6:13, Deuteronomy 10:20. He that sweareth by any person, or thing, doth two things:
1. He attributes to the thing, or person, by which he sweareth, a knowledge of the heart and the secret intention.
2. He calleth upon the person, or thing, by which he sweareth, to be his judge, or to take a revenge upon him, in case he doth not believe in his heart what he affirms or denieth with his words to be true or false; otherwise an oath is no security at all. From whence appeareth, that it is unreasonable for any to swear by any other than God, who alone can have a knowledge of the truth, and security of the heart; and that he who sweareth by any creature committeth idolatry in his heart, and in his heart doth indeed blaspheme, paying a Divine homage to a creature, and attributing to the creature what only agreeth to the Creator. The Pharisees, as it seemeth, had taught the people, that it was lawful to swear by the creature, but all oaths by creatures did not bind to the performance of the thing promised by such oaths: if a man swear by the temple, or by the altar, it was nothing, no man was bound by such oaths to perform the thing for which such oaths were given as a security. But if any man swear by the gold of the temple, or by a gift which he brought to the altar, these oaths did bind him. By the gold of the temple is not to be understood the golden vessels used in the temple, nor the golden plates with which the several parts of the temple shined; but the gold which was brought as an offering into the temple, and put into the treasury there; of which, and of the gifts, the priests and officers about the temple had a considerable share, which made them equalize an oath by these to an oath made by the name of God itself.
1. Our Saviour here showed the unreasonable folly of the tradition, and calleth them for it blind guides; for in reason, the temple sanctifying the gold must itself be more especially holy, that is, separate for a holy use. The temple was holy, so was the altar, before the gold was brought into it, but the gold was not holy till it was brought into the holy place, and there offered.
2. He lets them know, that oaths by the creatures once made did oblige, as much as if they had been made by God himself. They were indeed sinfully made, for men ought not to have sworn by creatures; but being made, those who made them were bound to perform them, if the matter of them were not sinful. For he that swears by the altar, swears by it, and by all the things thereon; and he who swears by the temple, swears by it, and by him that dwelleth therein; and he who swears by heaven, swears by the throne of God, and by him that sitteth thereon. For none who sware by inanimate things could possibly be imagined to call these things, which he knew had no life, no sense, no knowledge, to be a witness to the truth of his heart, as to what he believed, or what he intended. So as though he that sweareth by the creature be a profane swearer, yet he is bound by his oath, he indeed swearing by the God of those creatures. He hath reason to repent of the profane and unlawful form of his oath, but if the matter be what he may without sin perform, he is bound by his oath to the performance of it.