It is narrated from Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with them both) that there was a dispute between him and Sayyiduna Amr bin al-As (may Allah be pleased with him). Abdullah bin al-Zubayr (may Allah be pleased with them both) went in to Sa'id bin al-As while Amr (may Allah be pleased with him) was with him on the couch. Sa'id said to Abdullah bin al-Zubayr: "Sit here." He said: "No, the Messenger of Allah (peace and blessings be upon him) decreed that the two parties to a dispute should sit in front of the judge."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13843