Matthew 18:31-35 (NKJV)
So when his fellow servants saw what had been done, they were very grieved, and came and told their master all that had been done. Then his master, after he had called him,
You wicked servant! I forgave you all that debt because you begged me. Should you not also have had compassion on your fellow servant, just as I had pity on you? And his master was angry, and delivered him to the torturers until he should pay all that was due to him.
So My heavenly Father also will do to you if each of you, from his heart, does not forgive his brother his trespasses.