2 Corinthians 13:2-3

I have already warned those who have sinned in the past and all the rest as well, and I warn them now even though I am absent [from you] as I did when I was with you the second time, that if I come back I will not spare anyone, since you seek [forensic] proof that Christ is speaking in and through me. He is not weak or ineffective in dealing with you, but powerful within you.