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

1 This is the third time I am coming to you. "In the mouth of two or three witnesses shall every word be established." 2 I told you before, and fortell you as if I were present the second time and, being absent, now I write to those 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, which toward you is not weak, but is mighty in you.
10 Therefore I write these things being absent, lest, were I present, I should use sharpness, according to the power which the Lord hath given me for edification, and not for destruction.