Narrated `Urwa:

When a man from the Ansar quarreled with Az-Zubair, the Prophet (ﷺ) said, "O Zubair! Irrigate (your land) first and then let the water flow (to the land of the others)." "On that the Ansari said, (to the Prophet), "It is because he is your aunt's son." On that the Prophet (ﷺ) said, "O Zubair! Irrigate till the water reaches the walls between the pits around the trees and then stop (i.e. let the water go to the other's land)." I think the following verse was revealed concerning this event: "But no, by your Lord They can have No faith Until they make you judge In all disputes between them." (4.65)