Matthew 6:15

Ἐὰν δὲ μὴ ἀφῆτε τοῖς ἀνθρώποις τὰ παραπτώματα αὐτῶν, οὐδὲ ὁ Πατὴρ ὑμῶν ἀφήσει τὰ παραπτώματα ὑμῶν.

But if you do not forgive men their transgressions, neither will your Father forgive your transgressions.