Sunan Ibn Majah Book 16, Hadith 46
“The Messenger of Allah (ﷺ) ruled concerning the stream of Mahzur that the higher ground took precedence over the lower, so the higher ground should be irrigated until the water reached the ankles, then it should be released to those who were lower.
a man from among the Ansar had a dispute with Zubair in the presence of the Messenger of Allah (ﷺ) concerning the streams of the Harrah with which he irrigated his palm trees. The Ansari said: “Let the water flow,” but he refused. So they referred their dispute to the Messenger of Allah (ﷺ). The Messenger of Allah (ﷺ) said: “Irrigate (your trees) O Zubair, then let the water flow to your neighbor.” The Ansari became angry and said: “O Messenger of Allah (ﷺ), is it because he is your cousin (son of your paternal aunt)?” The expression of the Messenger of Allah (ﷺ) changed, then he said: “O Zubair, irrigate (your trees) then retain the water until it reaches the walls.” Zubair said: “I think this Verse was revealed concerning that: “But no, by your Lord, they make you (O Muhammad) judge in all disputes between them, and find in themselves no resistance against your decisions, and accept (them) with full submission An-Nisa 4.65
the Messenger of Allah (ﷺ) ruled concerning the stream of Mahzur that the water should be retained until it reached the ankles, then released.