وَلِلْبَيْهَقِيِّ: «اَلْمَاءُ طَاهِرٌ إِلَّا إِنْ تَغَيَّرَ رِيحُهُ، أَوْ طَعْمُهُ، أَوْ لَوْنُهُ; بِنَجَاسَةٍ تَحْدُثُ فِيهِ»
“Water is pure unless any impure thing is added which changes its smell, taste and colour”.
Bulugh al-Maram 4, Book 1, The Book of Purification, Hadith 4. 1 min read