2 Corinthians 13:1-3; 2 Corinthians 13:10

1 This [is] the third [time] I am coming to you: By the mouth of two or three witnesses shall every word be established.

2 I told you before, and foretell you, as if I were present, the second time; and being absent now I write to them who heretofore have sinned, and to all others, that, if I come again, I will not spare;

3 Since ye seek a proof of Christ speaking in me, who toward you is not weak, but is mighty in you.

10 Therefore I write these things being absent, lest being present I should use sharpness, according to the power which the Lord hath given me to edification, and not to destruction.