Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Do not withhold excess water to prevent (the growth of) grass." Sufyan ibn ‘Uyaynah (may Allah have mercy on him) says: "Water, grass, and fire—do not prevent (anyone) from these three things."
Hadith Referenceالمنتقى ابن الجارود / كتاب البيوع والتجارات / 596