Hebrews 7:20-28

And inasmuch as it is not without the taking of an oath (for they indeed have been made priests without an oath; but he with an oath by him that saith of him, The Lord sware and will not repent himself, Thou art a priest for ever); by so much also hath Jesus become the surety of a better covenant. And they indeed have been made priests many in number, because that by death they are hindered from continuing: but he, because he abideth for ever, hath his priesthood unchangeable. Wherefore also he is able to save to the uttermost them that draw near unto God through him, seeing he ever liveth to make intercession for them. For such a high priest became us, holy, guileless, undefiled, separated from sinners, and made higher than the heavens; who needeth not daily, like those high priests, to offer up sacrifices, first for his own sins, and then for the sins of the people: for this he did once for all, when he offered up himself. For the law appointeth men high priests, having infirmity; but the word of the oath, which was after the law, appointeth a Son, perfected for evermore.