2 Corinthians 13:2 - Ellicott's Commentary On The Whole Bible

I told you before, and foretell you... — Better, I have warned you before (referring, probably, to the threat of 1 Corinthians 4:13-19, and implied in 2 Corinthians 1:23). The chief objects of this rigour were to be those whom he had described previously as “having sinned beforehand” (see Note on 2 Corinthians 12:21); but he adds that his work as judge will extend to all the rest of the offenders. What he has in view is obviously passing a sentence of the nature of an excommunication on the offenders, “delivering them to Satan” (1 Corinthians 5:5; 1 Timothy 1:20), with the assured confidence that that sentence would be followed by some sharp bodily suffering. In that case men would have, as he says in the next verse, a crucial test whether Christ was speaking in him, and learn that he whom they despised as infirm had a reserve-force of spiritual power, showing itself in supernatural effects even in the regions of man’s natural life.