Catechism of the Catholic Church §1576 — excerpt
Since the sacrament of Holy Orders is the sacrament of the apostolic ministry, it is for the bishops as the successors of the apostles to hand on the "gift of the Spirit," The "apostolic line."
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Also cites: LG 21 # 2 · LG 20 · DS 794 · DS 802 · CIC, can. 1012 · CCEO, can. 744 · 747