'Oath' in the Bible

for men indeed do swear by the greater, and an end of all controversy to them for confirmation is the oath,

in which God, more abundantly willing to shew to the heirs of the promise the immutability of his counsel, did interpose by an oath,

And inasmuch as it is not apart from oath, (for those indeed apart from oath are become priests,

and he with an oath through Him who is saying unto him, 'The Lord sware, and will not repent, Thou art a priest -- to the age, according to the order of Melchisedek;')

for the law doth appoint men chief priests, having infirmity, but the word of the oath that is after the law appointeth the Son -- to the age having been perfected.