'Complaint' in the Bible

In those days, as the number of the disciples was multiplying, there arose a complaint by the Hellenistic Jews against the Hebraic Jews that their widows were being overlooked in the daily distribution.

If any of you has a legal dispute against another, do you dare go to court before the unrighteous, and not before the saints?

accepting one another and forgiving one another if anyone has a complaint against another. Just as the Lord has forgiven you, so you must also forgive.