that the Prophet ﷺ said: "This Ayah was revealed about the people of Quba: In it are men who love to purify themselves. And Allah loves those who make themselves pure (9:108)." He said: "They used water to perform Istinja so this Ayah was revealed about them."
عَنِ النَّبِيِّ ﷺ قَالَ نَزَلَتْ هَذِهِ الآيَةُ فِي أَهْلِ قُبَاء (فِيهِ رِجَالٌ يُحِبُّونَ أَنْ يَتَطَهَّرُوا وَاللَّهُ يُحِبُّ الْمُطَّهِّرِينَ ) قَالَ كَانُوا يَسْتَنْجُونَ بِالْمَاءِ فَنَزَلَتْ هَذِهِ الآيَةُ فِيهِمْ قَالَ هَذَا حَدِيثٌ غَرِيبٌ مِنْ هَذَا الْوَجْهِ قَالَ وَفِي الْبَابِ عَنْ أَبِي أَيُّوبَ وَأَنَسِ بْنِ مَالِكٍ وَمُحَمَّدِ بْنِ عَبْدِ اللَّهِ بْنِ سَلاَمٍ