6 Bible Verses about Oaths, Divine

For when God gave his promise to Abraham, because he could swear by no greater, he sware by himself, saying, "surely I will heap blessings upon thee, and will give thee a numerous posterity."

for when men swear by a superior, the ratifying what they say with an oath, puts an end to all further debate. wherefore God was willing to give the heirs of promise a stronger proof of the immutability of his counsel, by the intervention of an oath: that by two immutable things in which it was impossible for God to deceive us, we, who have no other refuge to fly to, but to maintain our present hopes,

to show regard to our forefathers, in performing his holy covenant, the oath which he made to our father Abraham, to grant us this favour,

that, as he was a prophet, and knowing that God had sworn to him, to place the fruit of his loins upon his throne: foreseeing this,

for it is said, "thou art a priest for ever after the order of Melchisedec." wherefore the preceeding law is abolished for its being weak and useless. for the law made no man perfect, but this was effected by introducing a better hope, which brings us nearer to the divine presence.read more.
Besides those priests were establish'd without any oath: but this with an oath, by him that said to him, "the Lord has swore, and will not repent, thou art a priest for ever after the order of Melchisedec." so that Jesus was made guarantee of an alliance so much the more excellent, as it was not without the solemnity of an oath. besides, the priesthood then devolv'd to many, death depriving them of a lasting possession. but he, by virtue of his immortal state, hath a priesthood that does not pass by succession. so that he has an uninterrupted power to save those, that come to God by him, because he ever lives to make intercession for them. and indeed we wanted an high priest of such a character, one that is holy, innocent, undefiled, one that is separated from sinful men, and exalted above the heavens; one who was under no necessity, as those high priests of the law were, to offer up daily sacrifices, first for his own sins, and then for those of the people: having done this once for all, by offering up himself. for the law appointed frail mortals to be high priests, but the oracle pronounc'd with an oath, which was since the law, established the son, who is crown'd with immortal perfections.

wherefore I was displeased with that generation, and said, they do alway err in their hearts; and they have not known my ways. so I swear in my wrath, that they should not enter into my rest."