كتاب المياه
2  
The Book of Water
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Chapter: Allah, The Mighty and Sublime, says: And We sent down pure water from the sky. [1] And He, the Mighty and Sublime, says: And He caused water to descend on you from the sky, to clean you thereby. [2] And He, the Most High, says: And you find no water, then perform Tayammum with clean earth [3]
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Sunan an-Nasa'i 325
It was narrated from Ibn 'Abbas that one of the wives of the Prophet (ﷺ) performed Ghusl from Janabah, and the Prophet (ﷺ) performed Wudu' with her leftover water. She mentioned that to him and he said:
"Water is not made impure by anything." [1]

[1] See the following versions.
أَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ الْمُبَارَكِ، عَنْ سُفْيَانَ، عَنْ سِمَاكٍ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ بَعْضَ، أَزْوَاجِ النَّبِيِّ صلى الله عليه وسلم اغْتَسَلَتْ مِنَ الْجَنَابَةِ فَتَوَضَّأَ النَّبِيُّ صلى الله عليه وسلم بِفَضْلِهَا فَذَكَرَتْ ذَلِكَ لَهُ فَقَالَ ‏ "‏ إِنَّ الْمَاءَ لاَ يُنَجِّسُهُ شَىْءٌ ‏"‏ ‏.‏
Grade: Da'if (Darussalam)
Reference : Sunan an-Nasa'i 325
In-book reference : Book 2, Hadith 1
English translation : Vol. 1, Book 2, Hadith 326