Abdullah bin al-Zubayr (may Allah be pleased with him) said that a man of the Ansar disputed with al-Zubayr (may Allah be pleased with him) before the Messenger of Allah (peace and blessings be upon him) concerning the watering of date palms. The Ansari said: Let the water flow. Al-Zubayr (may Allah be pleased with him) refused. They brought the dispute to the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) said: "O Zubayr! After watering the date palms, let the water go to your neighbour." The Ansari became angry and said: (This is because) he is the son of your paternal aunt! At that, the colour of the face of the Messenger of Allah (peace and blessings be upon him) changed. Then he (peace and blessings be upon him) said: "O Zubayr! Water (your palms) and then hold back the water until it reaches the walls." And al-Zubayr (may Allah be pleased with him) said: I think this verse was revealed about this: "But no, by your Lord, they will not (truly) believe until they make you judge in their disputes." [Surah al-Nisa: 65]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / 20286