Malik related to me from Abu'r-Rijal Muhammad ibn Abd ar-Rahmanfrom his mother Amra bint Abd ar-Rahman that she informed him that theMessenger of Allah, may Allah bless him and grant him peace, said, "Donot withhold the surplus water of a well from people."
USC-MSA web (English) reference: Book 36, Hadith 30
Arabic reference: Book 36, Hadith 1434