103 We are sure it is unnecessary for us to mention it, but priests should be careful to be always obedient and submissive to their bishop. As Saint Ignatius of Antioch said: "Since you are subject to your bishop as to Jesus Christ,... whatever you do must be done in union with your bishop." (51) "All who belong to God and Jesus Christ are in union with their bishop." (52)
Source: Ad Petri Cathedram (Vatican.va)