'Grievance' in the Bible

So if you are presenting your offering at the altar, and while there you remember that your brother has something [such as a grievance or legitimate complaint] against you,

So then, if Demetrius and the craftsmen who are with him have a complaint against anyone, the courts are in session and proconsuls are available; let them bring charges against one another there.

bearing graciously with one another, and willingly forgiving each other if one has a cause for complaint against another; just as the Lord has forgiven you, so should you forgive.