Full Sharh — Mishkat al-Masabih 444
وَعَن أبي سعيد الْخُدْرِيّ قَالَ: قيل يَا رَسُولَ اللَّهِ أَنَتَوَضَّأُ مِنْ بِئْرٍ بُضَاعَةَ وَهِيَ بِئْرٌ يُلْقَى فِيهَا الْحِيَضُ وَلُحُومُ الْكِلَابِ وَالنَّتْنُ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِنَّ الْمَاءَ طَهُورٌ لَا يُنَجِّسُهُ شَيْءٌ» . رَوَاهُ أَحْمد وَالتِّرْمِذِيّ وَأَبُو دَاوُد وَالنَّسَائِيّ
English Translation
Abu Sa'id al-Khudri said that some people asked God’s messenger whether they might perform ablution out of the well of Buda‘a, which was a well into which menstrual cloths, dead dogs and stinking things were thrown, and he replied, “Water is pure and is not defiled by anything.” Ahmad, Tirmidhi, Abu Dawud and Nasa’i transmitted it.
Source
Mishkat al-Masabih(مشكاة المصابيح)
Purification
Hadith Number
444