Sayyidah Umm Salamah (may Allah be pleased with her) narrates from the Prophet (peace and blessings be upon him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever is entrusted with the office of judge among the Muslims, let him be just in his seating, his gestures and his glances."
(b) Abu Abdullah al-Anazi narrates with his chain: "Let him be fair in his gestures, his glances and his speech."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / 20457