2 Corinthians 13:1-3 RSV

1 This is the third time I am coming to you. Any charge must be sustained by the evidence of two or three witnesses.
2 I warned those who sinned before and all the others, and I warn them now while absent, as I did when present on my second visit, that if I come again I will not spare them--
3 since you desire proof that Christ is speaking in me. He is not weak in dealing with you, but is powerful in you.