2 Corinthians 13:2

13:2 I said before when I was present the second time and now, though absent, I say again to those who sinned previously and to all the rest, that if I come again, I will not spare anyone,

2 Corinthians 13:8

13:8 For we cannot do anything against the truth, but only for the sake of the truth.

Titus 1:13

1:13 Such testimony is true. For this reason rebuke them sharply that they may be healthy in the faith