Matthew 6:15 in the King James Version
But if ye forgive not men their trespasses, neither will your Father forgive your trespasses.
Context
14 “For if you forgive men their trespasses, your heavenly Father will also forgive you.
15 But if you don’t forgive men their trespasses, neither will your Father forgive your trespasses.
16 “Moreover when you fast, don’t be like the hypocrites, with sad faces. For they disfigure their faces that they may be seen by men to be fasting. Most certainly I tell you, they have received their reward.