'Oath' in the Bible

For people swear by what is greater [than themselves], and the oath for confirmation [is the] end of all dispute for them.

In the same way God, [because he] wanted to show even more to the heirs of the promise the unchangeableness of his resolve, guaranteed [it] with an oath,

And by as much as [this was] not without an oath (for these on the one hand {have become priests} without an oath,

but he with an oath by the one who said to him, "The Lord has sworn and will not change his mind, 'You [are] a priest {forever}'"),

For the law appoints men [as] high priests who have weakness, but the statement of the oath, after the law, [appoints] a Son, who is made perfect {forever}.