'Oath' in the Bible

For men swear by one greater than themselves, and with them an oath given as confirmation is an end of every dispute.

In the same way God, desiring even more to show to the heirs of the promise the unchangeableness of His purpose, interposed with an oath,

And inasmuch as it was not without an oath

(for they indeed became priests without an oath, but He with an oath through the One who said to Him,“The Lord has swornAnd will not change His mind,‘You are a priest forever’”);

For the Law appoints men as high priests who are weak, but the word of the oath, which came after the Law, appoints a Son, made perfect forever.