Salim, the freed slave of Sayyiduna Abdullah bin Amr (may Allah be pleased with him), said: People offered me thirty thousand for the surplus water of his land at al-Waht. So I wrote about this to Abdullah bin Amr (may Allah be pleased with him), and he wrote back to me: Do not sell it; rather, set up your turns of watering, then give water to those nearest to you, and then the next nearest, for I heard the Messenger of Allah (peace and blessings be upon him) forbidding the sale of surplus water.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 11062