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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
ahmad:12100 – Ismāʿīl b. Ibrāhīm > Rawḥ b. al-Qāsim > ʿAṭāʾ b. Abū Maymūnah > Anas b. Mālik

Whenever the Prophet ﷺ went to answer the call of nature, I used to bring water with which he used to clean his private parts. (Using translation from Bukhārī 217)  

أحمد:١٢١٠٠ – حَدَّثَنَا إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ حَدَّثَنَا رَوْحُ بْنُ الْقَاسِمِ عَنْ عَطَاءِ بْنِ أَبِي مَيْمُونَةَ عَنْ أَنَسِ بْنِ مَالِكٍ قَالَ

كَانَ رَسُولُ اللهِ ﷺ إِذَا تَبَرَّزَ لِحَاجَتِهِأَتَيْتُهُ بِمَاءٍ فَيَغْسِلُ بِهِ  

See similar narrations below:

Collected by Bukhārī, Muslim
bukhari:217 – Yaʿqūb b. Ibrāhīm > Ismāʿīl b. Ibrāhīm > Rawḥ b. al-Qāsim > ʿAṭāʾ b. Abū Maymūnah > Anas b. Mālik

Whenever the Prophet ﷺ went to answer the call of nature, I used to bring water with which he used to clean his private parts.  

البخاري:٢١٧ – حَدَّثَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ قَالَ حَدَّثَنَا إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ قَالَ حَدَّثَنِي رَوْحُ بْنُ الْقَاسِمِ قَالَ حَدَّثَنِي عَطَاءُ بْنُ أَبِي مَيْمُونَةَ عَنْ أَنَسِ بْنِ مَالِكٍ قَالَ

كَانَ النَّبِيُّ ﷺ إِذَا تَبَرَّزَ لِحَاجَتِهِ أَتَيْتُهُ بِمَاءٍ فَيَغْسِلُ بِهِ  

muslim:271b – Zuhayr b. Ḥarb And ʾAbū Kurayb Wa-al-Lafẓ Lizuhayr > Ismāʿīl / Ibn ʿUlayyah > Rawḥ b. al-Qāsim > ʿAṭāʾ b. Abū Maymūnah > Anas b. Mālik

The Messenger of Allah ﷺ went to a far-off place in the desert (hidden from the sight of human beings) for relieving himself. Then I brought water for him and he cleansed himself.  

مسلم:٢٧١b – وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ وَأَبُو كُرَيْبٍ وَاللَّفْظُ لِزُهَيْرٍ حَدَّثَنَا إِسْمَاعِيلُ يَعْنِي ابْنَ عُلَيَّةَ حَدَّثَنِي رَوْحُ بْنُ الْقَاسِمِ عَنْ عَطَاءِ بْنِ أَبِي مَيْمُونَةَ عَنْ أَنَسِ بْنِ مَالِكٍ قَالَ

كَانَ رَسُولُ اللَّهِ ﷺ يَتَبَرَّزُ لِحَاجَتِهِ فَآتِيهِ بِالْمَاءِ فَيَتَغَسَّلُ بِهِ