2 Corinthians 13:1-3 WEB

1 This is the third time I am coming to you. "At the mouth of two or three witnesses shall every word established."
2 I have said beforehand, and I do say beforehand, as when I was present the second time, so now, being absent, I write to those who have sinned before now, and to all the rest, that, if I come again, I will not spare;
3 seeing that you seek a proof of Christ that speaks in me; who toward you is not weak, but is powerful in you.