Ad Apostolorum Principis §40

⁴⁰ And when We later addressed to you the letter Ad Sinarum gentem, We again referred to this teaching in these words: "The power of jurisdiction which is conferred directly by divine right on the Supreme Pontiff comes to bishops by that same right, but only through the successor of Peter, to whom not only the faithful but also all bishops are bound to be constantly subject and to adhere both by the reverence of obedience and by the bond of unity."