وَحَدَّثَنِي مَالِكٌ، عَنْ أَبِي الرِّجَالِ، مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ عَنْ أُمِّهِ، عَمْرَةَ بِنْتِ عَبْدِ الرَّحْمَنِ أَنَّهَا أَخْبَرَتْهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ لاَ يُمْنَعُ نَقْعُ بِئْرٍ ‏"‏ ‏.‏

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." Translation Not Available

Book Ref: Muwatta Imam Malik Book 36 Hadith 1434
Web Ref:  Muwatta Imam Malik Book 36 Hadith 30