CCC 1562
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"Christ, whom the Father hallowed and sent into the world, has, through his apostles, made their successors, the bishops namely, sharers in his consecration and mission; and these, in their turn, duly entrusted in varying degrees various members of the Church with the office of their ministry." LG 28; cf. Jn 10:36. "The function of the bishops' ministry was handed over in a subordinate degree to priests so that they might be appointed in the order of the priesthood and be co-workers of the episcapal order for the proper fulfillment of the apostolic mission that had been entrusted to it by Christ." PO 2 # 2.
Read the full chapter 3. The Sacraments at the Service of Communion ¶1533–1666