"I never saw the Messenger of Allah come out of the toilet without first (cleansing himself) with water."  

مَا رَأَيْتُ رَسُولَ اللَّهِ ﷺ خَرَجَ مِنْ غَائِطٍ قَطُّ إِلاَّ مَسَّ مَاءً  

"Abu Ayyub Al-Ansari, Jabir bin 'Abdullah, and Anas bin Malik told me that when this Verse: "In it (the mosque) are men who love to clean and to purify themselves. And Allah loves those who make themselves clean and pure." was revealed, the Messenger of Allah said: 'O Ansar! Allah has praised you for your cleanliness. What is the nature of your cleanliness?' They said: 'We perform ablution for prayer and we take bath to cleanse ourselves of impurity due to sexual activity, and we clean ourselves with water (after urinating). He said: 'This is what it is. So adhere to it.'"  

أَنَّ هَذِهِ الآيَةَ نَزَلَتْ {فِيهِ رِجَالٌ يُحِبُّونَ أَنْ يَتَطَهَّرُوا وَاللَّهُ يُحِبُّ الْمُطَّهِّرِينَ} قَالَ رَسُولُ اللَّهِ ﷺ يَا مَعْشَرَ الأَنْصَارِ إِنَّ اللَّهَ قَدْ أَثْنَى عَلَيْكُمْ فِي الطُّهُورِ فَمَا طُهُورُكُمْ قَالُوا نَتَوَضَّأُ لِلصَّلاَةِ وَنَغْتَسِلُ مِنَ الْجَنَابَةِ وَنَسْتَنْجِي بِالْمَاءِ قَالَ هُوَ ذَلِكَ فَعَلَيْكُمُوهُ  

The Prophet used to wash his private parts three times. Ibn 'Umar said: "We did that and we found it to be healing and a means of purification."  

أَنَّ النَّبِيَّ ﷺ كَانَ يَغْسِلُ مَقْعَدَتَهُ ثَلاَثًا قَالَ ابْنُ عُمَرَ فَعَلْنَاهُ فَوَجَدْنَاهُ دَوَاءً وَطُهُورًا قَالَ أَبُو الْحَسَنِ بْنُ سَلَمَةَ حَدَّثَنَا أَبُو حَاتِمٍ وَإِبْرَاهِيمُ بْنُ سُلَيْمَانَ الْوَاسِطِيُّ قَالاَ حَدَّثَنَا أَبُو نُعَيْمٍ حَدَّثَنَا شَرِيكٌ نَحْوَهُ  

"The Messenger of Allah said: 'The (following) was revealed about the people of Quba': 'In it (the mosque) are men who love to clean and purify themselves. And Allah loves those who make themselves clean and pure.'" He said: 'They used to clean themselves with water (after urinating), and this Verse was revealed concerning them.'"  

قَالَ رَسُولُ اللَّهِ ﷺ نَزَلَتْ فِي أَهْلِ قُبَاءٍ {فِيهِ رِجَالٌ يُحِبُّونَ أَنْ يَتَطَهَّرُوا وَاللَّهُ يُحِبُّ الْمُطَّهِّرِينَ} قَالَ كَانُوا يَسْتَنْجُونَ بِالْمَاءِ فَنَزَلَتْ فِيهِمْ هَذِهِ الآيَةُ