Sahih al-Bukhari 2354
Sahih al-Bukhari · Book 42: Distribution of Water · Whoever said, “The owner of the water has the right to drink till he is satisfied, as the Prophet ﷺ said, ‘Superfluous water should not be withheld from others.’”
Narrated Abu Huraira:
حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ ، حَدَّثَنَا اللَّيْثُ ، عَنْ عُقَيْلٍ ، عَنِ ابْنِ شِهَابٍ ، عَنِ ابْنِ الْمُسَيَّبِ ، وَأَبِي، سَلَمَةَ عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ تَمْنَعُوا فَضْلَ الْمَاءِ لِتَمْنَعُوا بِهِ فَضْلَ الْكَلإِ " .
that Allah's Messenger (ﷺ) said, "Do not withhold the superfluous water in order to withhold the superfluous grass."