Narrated 'Abdullah bin az-Zubair (RA):
Allah's Messenger (ﷺ) ruled that the two opposing parties in a dispute should sit in front of the judge.[Reported by Abu Dawud. al-Hakim graded it Sahih (authentic)].
Reference: Bulugh al-Maram 1413
In-book reference: Book 14, Hadith 17
English translation: Book 14, Hadith 1413