وَعَنْ عَبْدِ اَللَّهِ بْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا
قَالَ: قَالَ رَسُولُ اَللَّهِ صَلَّى عَلَيْهِ وَسَلَّمَ: «إِذَا كَانَ اَلْمَاءَ قُلَّتَيْنِ لَمْ يَحْمِلْ اَلْخَبَثَ» وَفِي لَفْظٍ: «لَمْ يَنْجُسْ»
The Messenger of Allah (sallallahu alayhi wa sallam) said: “If there is enough water to fill two pots (Qulla), it carries no impurity,” Another version has: “It does not become unclean”. {Al-Arbaa reported it. Ibn Khuzaima, Ibn Hibban and Al-Hakim graded it Sahih (sound)].
Bulugh al-Maram 5, Book 1, The Book of Purification, Hadith 5. 1 min read