Hadithcore
Bulugh al-Maram, 9

And Ashab As-Sunan (compilers of the prophet’s sayings) reported that one of the wives of the Prophet (ﷺ) took bath from a vessel, then came the Prophet (ﷺ) and when he wanted to take bath from that (vessel), she said, “I was sexually impure”. He said, “Water does not become sexually impure”. [At-Tirmidhi and Ibn huzaima graded it Sahih (sound)].

وَلِأَصْحَابِ "اَلسُّنَنِ": { اِغْتَسَلَ بَعْضُ أَزْوَاجِ اَلنَّبِيِّ ‏- صلى الله عليه وسلم ‏-فِي جَفْنَةٍ, فَجَاءَ لِيَغْتَسِلَ مِنْهَا, فَقَالَتْ لَهُ: إِنِّي كُنْتُ جُنُبًا, فَقَالَ: "إِنَّ اَلْمَاءَ لَا يُجْنِبُ" } وَصَحَّحَهُ اَلتِّرْمِذِيُّ, وَابْنُ خُزَيْمَةَ [1]‏ .‏

References2 variants
In-Book Reference
Book 1, Hadith 10
English Reference
Book 1, Hadith 11
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