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Among the duties mentioned in this Psalm we find this of constancy and faithfulness in keeping those promises which we have confirmed by an oath. Because the greatest temptation to the breaking of oaths proceeds from fear of some temporal damage, or prospect of some worldly advantage, therefore it is said, "He that sweareth to his own hurt, and changeth not."

I. IN WHAT CASES AN OATH DOTH OBLIGE. No oath can oblige to that which is impossible; or to that which is unlawful; for justice requires that we do not invade the rights and privileges of other men. Oaths contrary to charity or mercy or humanity are void. No oath can oblige when it hinders a greater good. What if the matter be purely indifferent? There can be here no occasion of difficulty, except the matter be also of no moment. He is undoubtedly guilty of great irreverence towards God, that will cite His name to a trifle. If the matter of the oath be such as causeth a man to doubt whether it be lawful or no, in that case he had better perform it. There are cases relating to the person that swears. Here, whensoever we shall determine that an oath doth not bind, it will be for the want of the person's rightly understanding that he made one. A man may not know what an oath is; or he may swear when affected by anger, or by drink, or by fear; or by any other passion; or if a man swears to save his life, as from robbers.

II. IN WHAT SENSE AN OATH OUGHT TO BE TAKEN. That sense is to be taken which is most suitable to the business men are about. We may not precisely, without limitation, accept the sense of the swearer, or of the imposer, or that which the words of the oath will bear. The swearer may equivocate, or use mental reservations. What if a man swears and doth not intend to swear? Something of intention is always required to an oath. It would be a frivolous excuse for a man to say, he intended to swear, but did not intend to be obliged.

III. HOW GREAT THE OBLIGATION OF AN OATH IS. It is a solemn invocation of God to witness what we say, by His favour and mercy to us, if it be true; or by His vengeance upon us if it be false. It is a high advantage and privilege which God vouchsafeth to us, in that He gives us leave, upon urgent and weighty causes, to make use of His glorious Name as a seal to confirm the truth of what we assent. If, therefore, we take it up to avouch a falsehood, we are exceedingly ungrateful, we falsify that seal, we profane that dreadful name, we apply that which is most sacred to the worst of uses...For these and the like causes an oath hath generally been looked upon as a sufficient assurance and confirmation of the truth of any matter. He that seriously considers what an oath is cannot surely believe that any man is above the obligation of it. And as no man can be too great for such an obligation himself, so neither can he dispense with it in others.

(Henry Hellier, M. A.)

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KJV: In whose eyes a vile person is contemned; but he honoureth them that fear the LORD. He that sweareth to his own hurt, and changeth not.

WEB: In whose eyes a vile man is despised, but who honors those who fear Yahweh; he who keeps an oath even when it hurts, and doesn't change;