أَخْبَرَنَا الْحُسَيْنُ بْنُ حُرَيْثٍ الْمَرْوَزِيُّ، قَالَ حَدَّثَنَا أَبُو أُسَامَةَ، عَنِ الْوَلِيدِ بْنِ كَثِيرٍ، عَنْ مُحَمَّدِ بْنِ جَعْفَرِ بْنِ الزُّبَيْرِ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ عُمَرَ، عَنْ أَبِيهِ، قَالَ سُئِلَ رَسُولُ اللَّهِ صلى الله عليه وسلم عَنِ الْمَاءِ وَمَا يَنُوبُهُ مِنَ الدَّوَابِّ وَالسِّبَاعِ فَقَالَ " إِذَا كَانَ الْمَاءُ قُلَّتَيْنِ لَمْ يَحْمِلِ الْخَبَثَ " .
It was narrated from 'Ubaidullah bin 'Abdullah bin 'Umar that his father said: "The Messenger of Allah (PBUH) was asked about water and how some animals and carnivorous beasts might drink from it. He said: 'If the water is more than two Qullahs, it will not become filthy.'" Translation Not Available
Book Ref: Sunan An Nisai Book 2 Hadith 328
Web Ref: Sunan An Nisai Vol 1 Book 2 Hadith 329