Hebrews 6:16

“For men verily swear by the greater, etc..] These words contain a reason why God swore by himself, and why his promises, having an oath annexed to them, ought to be believed. Men when they swear, they swear by the greater; not by themselves, as God does, because there is one greater than they; not by any of the creatures on earth, nor by the angels in heaven, but by God; because he is the God of truth, the searcher of hearts, and who can take vengeance on perjurers: and an oath may lawfully be taken, when it is truth that is sworn to, and is just and good; and in cases of weight and moment; and in what is possible and right to perform; and when it is done with deliberation, in the fear of…”

“for confirmation--not to be joined, as English Version, to "an oath"; but to "an end" [ALFORD]. I prefer, "The oath is to them, in respect to confirmation (of one's solemn promise or covenant; as here, God's), an end of all contradiction (so the Greek is translated, Heb 12:3), or "gainsaying." This passage shows: (1) an oath is sanctioned even in the Christian dispensation as lawful; (2) that the limits to its use are, that it only be employed where it can put an end to contradiction in disputes, and for confirmation of a solemn promise.”

“For men verily swear by the greater - That is, they appeal to God. They never swear by one who is inferior to themselves. The object of the apostle in this declaration is to show that as far as this could be done it had been by God. He could not indeed swear by one greater than himself, but he could make his promise as certain as an oath taken by people was when they solemnly appealed to him. He could appeal to his own existence and veracity, which was at any time the most solemn form of an oath, and thus put the mind to rest in regard to the hope of heaven. And an oath for confirmation - An oath taken to confirm or establish anything. Is to them an end of all strife - That is, when two…”

“Men generally swear by him who is infinitely greater than themselves, and an oath for confirmation, to confirm what is promised or asserted, usually puts an end to all contradiction. This shows that an oath taken in a religious manner is lawful even under the gospel: otherwise the apostle would never have mentioned it with so much honour, as a proper means to confirm the truth Hebrews 6:17”

“6:16 It is a general principle in human relationships that when people take an oath, the oath is binding. If in human contexts oaths give assurance that something is true, an oath from God ought to inspire much greater confidence (6:17-19). • someone greater than themselves: Cp. 6:13.”

“swear: Heb 6:13; Gen 14:22, Gen 21:23; Mat 23:20-22 an oath: Gen 21:30, Gen 21:31, Gen 31:53; Exo 22:11; Jos 9:15-20; Sa2 21:2; Eze 17:16-20 Hebrews 6:17”