[Machine] The Prophet ﷺ was asked about water and what animals depend on it. The Prophet ﷺ said, "If water is two qullas, it does not carry impurities." It is confirmed and established through this narration that the hadith is authentic. It is clear that Abu Usama narrated the hadith from Al-Walid ibn Kathir, both of whom are reliable and trustworthy individuals. Shu'ayb ibn Ayyub As-Sarifi is also trustworthy, and the route to him is via Al-Walid ibn Kathir. Moreover, Al-Walid ibn Kathir followed Muhammad ibn Ja'far ibn Az-Zubair, and Muhammad ibn Ishaq ibn Yasir Al-Qurashi.  

سُئِلَ رَسُولُ اللَّهِ ﷺ عَنِ الْمَاءِ وَمَا يَنُوبُهُ مِنَ الدَّوَابِّ وَالسِّبَاعِ فَقَالَ النَّبِيُّ ﷺ «إِذَا كَانَ الْمَاءُ قُلَّتَيْنِ لَمْ يَحْمِلِ الْخَبَثَ» «وَقَدْ صَحَّ وَثَبَتَ بِهَذِهِ الرِّوَايَةِ صِحَّةُ الْحَدِيثِ وَظَهَرَ أَنَّ أَبَا أُسَامَةَ سَاقَ الْحَدِيثَ عَنِ الْوَلِيدِ بْنِ كَثِيرٍ عَنْهُمَا جَمِيعًا فَإِنَّ شُعَيْبَ بْنَ أَيُّوبَ الصَّرْيَفَيْنِيُّ ثِقَةٌ مَأْمُونٌ وَكَذَلِكَ الطَّرِيقُ إِلَيْهِ وَقَدْ تَابَعَ الْوَلِيدَ بْنَ كَثِيرٍ عَلَى رِوَايَتِهِ عَنْ مُحَمَّدِ بْنِ جَعْفَرِ بْنِ الزُّبَيْرِ مُحَمَّدُ بْنُ إِسْحَاقَ بْنِ يَسَارٍ الْقُرَشِيُّ»