For he testifieth, Thou art a priest for ever after the order of Melchisedec.
Ver. 17. For he testfieth] Thus the author still argueth out of Scripture, as knowing that quicquid non habet authoritatem ex Scripturis, eadem facilitate contemnitur qua approbatur, whatsoever is not grounded upon Scripture authority is as easily rejected as received. (Jerome.)