2 Corinthians 13:1-3

1This is the third time I am coming to you. “Every matter must be established by the testimony of two or three witnesses.”1

2I already warned you the second time I was with you. So now in my absence I warn those who sinned earlier and everyone else: If I return, I will not spare anyone, 3since you are demanding proof that Christ is speaking through me. He is not weak in dealing with you but is powerful among you.