Mishkat al-Masabih 2993

‘Urwa said az-Zubair had a dispute with one of the Ansar about streamlets in the lava plain, and the Prophet (ﷺ) said, “Water your ground, Zubair, then let the water run to your neighbour.” The Ansari said, “It is because he is your cousin.” Thereupon his face changed colour and he said, “Water your ground, Zubair, then keep back the water till it returns to the embankment, and afterwards let it run to your neighbour.” So the Prophet (ﷺ) paid regard to az-Zubair’s right by the clear decision when the Ansari made him angry and he had given them advice which would have made matters easy for both of them.
(Bukhari and Muslim.)