2 Corinthians 2:9-11

For to this end also did I write, that I might know the proof of you, whether ye are obedient in all things. But to whom ye forgive anything, I forgive also: for what I also have forgiven, if I have forgiven anything, for your sakes have I forgiven it in the presence of Christ; that no advantage may be gained over us by Satan: for we are not ignorant of his devices.