Mark 11:26 (NKJV)
26 But if you do not forgive, neither will your Father in heaven forgive your trespasses.”
Matthew 6:15 (CJB)
15 but if you do not forgive others their offenses, your heavenly Father will not forgive yours.
Matthew 5:23-24 (AMP)
23 So if when you are offering your gift at the altar you there remember that your brother has any [grievance] against you,
24 Leave your gift at the altar and go. First make peace with your brother, and then come back and present your gift.