§1. In exercising the function of a pastor, a diocesan bishop is to show himself concerned for all the Christian faithful entrusted to his care, of whatever age, condition, or nationality they are, whether living in the territory or staying there temporarily; he is also to extend an apostolic spirit to those who are not able to make sufficient use of ordinary pastoral care because of the condition of their life and to those who no longer practice their religion.
§2. If he has faithful of a different rite in his diocese, he is to provide for their spiritual needs either through priests or parishes of the same rite or through an episcopal vicar.
§3. He is to act with humanity and charity toward the brothers and sisters who are not in full communion with the Catholic Church and is to foster ecumenism as it is understood by the Church.
§4. He is to consider the non-baptized as committed to him in the Lord, so that there shines on them the charity of Christ whose witness a bishop must be before all people.
Source: Code of Canon Law (Vatican.va)