Those who formerly became priests took their office without an oath, but this one was addressed with an oath, “The Lord has sworn and will not change his mind, ‘Thou art a priest for ever.’ ”
God is not man, that he should lie, or a son of man, that he should repent. Has he said, and will he not do it? Or has he spoken, and will he not fulfil it?
Indeed, the law appoints men in their weakness as high priests, but the word of the oath, which came later than the law, appoints a Son who has been made perfect for ever.