2 Corinthians 13:1-3

This is the third time that I am coming to you. On the testimony of two or three witnesses every matter shall be confirmed.

I have previously said when I was present the second time, and though now absent I say in advance to those who have sinned in the past and to all the rest as well, that if I come again I will not spare anyone,

since you are seeking proof of the Christ who speaks in me, who is not weak toward you, but mighty in you.