'Parties' in the Bible

"You are to carry out your duties in the fear of the LORD, serving him faithfully with your whole heart. No matter what case comes before you from your fellow citizens who live in their own cities, whether it's a dispute between blood relatives or a dispute regarding the Law and the commands, statutes, or verdicts, you are to warn the parties so that they do not become guilty in the LORD's presence and so that anger does not come upon you and your fellow citizens.