Matthew 6:14-15 NIV
For if you forgive men when they sin against you, your heavenly Father will also forgive you. But if you do not forgive men their sins, your Father will not forgive your sins.
2 corinthians 2:5-8 NIV
If anyone has caused grief, he has not so much grieved me as he has grieved all of you to some extent—not to put it too severely. The punishment inflicted on him by the majority is sufficient. Now instead, you ought to forgive and comfort him, so that he will not be overwhelmed by excessive sorrow. I urge you, therefore, to reaffirm your love for him.
Luke 17:3-4 NIV
So watch yourselves. “If your brother sins, rebuke him, and if he repents forgive him. If he sins against you seven times in a day, and seven times comes back to you and says , ‘I repent,’ forgive him.”