Hadith 1:4
And Al-Baihaqi reported:
“Water is pure unless any impure thing is added which changes its smell, taste and colour”.
وَلِلْبَيْهَقِيِّ: { اَلْمَاءُ طَاهِرٌ إِلَّا إِنْ تَغَيَّرَ رِيحُهُ, أَوْ طَعْمُهُ, أَوْ لَوْنُهُ; بِنَجَاسَةٍ تَحْدُثُ فِيهِ } (6)
Original Reference: Bulugh al-Maram 4