Mark 11:26

But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses.
— Mark 11:26, King James Version

In other translations

World English Bible (WEB)

But if you do not forgive, neither will your Father in heaven forgive your transgressions."

Young's Literal Translation (YLT)

and, if ye do not forgive, neither will your Father who is in the heavens forgive your trespasses.'