Maliks Muwatta Book 36, Hadith Number 30.
Section : Judgement on Watering Land.
Malik related to me from Abu’r-Rijal Muhammad ibn Abd ar-Rahman from his mother Amra bint Abd ar-Rahman that she informed him that the Messenger of Allah, may Allah bless him and grant him peace, said, “Do not withhold the surplus water of a well from people.”