Context: Paul upbraids the church at Corinth for allowing sexual immorality among its members: a member is living with his father's wife. Paul had warned the Christians to keep apart from pagans who practice immorality: he is overwhelmed that fornication should exist among members of the church. As though Paul were actually there with the church, he has already pronounced his judgment on the erring man:
For I verily, as absent in body, but present in spirit, have judged already, as though I were present, concerning him that hath so done this deed,
In the name of our Lord Jesus Christ, when ye are gathered together, and my spirit, with the power of our Lord Jesus Christ,
To deliver such a one unto Satan for the destruction of the flesh, that the spirit may be saved in the day of the Lord Jesus.