Matthew 6:14-15
14 For if you will forgive men their offences, your heavenly Father will forgive you also your offences.
15 But if you will not forgive men, neither will your Father forgive you your offences.
Matthew 18:21-22
21 Then came Peter unto him and said: Lord, how often shall my brother offend against me, and I forgive him? till seven times?
22 Jesus saith to him: I say not to thee, till seven times; but till seventy times seven times.
Matthew 18:34-35
34 And his lord being angry, delivered him to the torturers until he paid all the debt.
35 So also shall my heavenly Father do to you, if you forgive not every one his brother from your hearts.
Ephesians 4:31-32
31 Let all bitterness, and anger, and indignation, and clamour, and blasphemy, be put away from you, with all malice.
32 And be ye kind one to another; merciful, forgiving one another, even as God hath forgiven you in Christ.