أَخْبَرَنَا عَبْدُ الرَّحْمَنِ بْنُ إِبْرَاهِيمَ، عَنْ عُمَرَ بْنِ عَبْدِ الْوَاحِدِ، عَنِ الأَوْزَاعِيِّ، عَنْ مُحَمَّدِ بْنِ الْوَلِيدِ، عَنِ الزُّهْرِيِّ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَامَ أَعْرَابِيٌّ فَبَالَ فِي الْمَسْجِدِ فَتَنَاوَلَهُ النَّاسُ فَقَالَ لَهُمْ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ دَعُوهُ وَأَهْرِيقُوا عَلَى بَوْلِهِ دَلْوًا مِنْ مَاءٍ فَإِنَّمَا بُعِثْتُمْ مُيَسِّرِينَ وَلَمْ تُبْعَثُوا مُعَسِّرِينَ ‏"‏ ‏.‏

It was narrated that Abu Hurairah said: "A Bedouin stood up and urinated in the Masjid, so the people grabbed him. The Messenger of Allah (PBUH) said to them: 'Leave him alone, and pour a bucket of water over his urine. For you have been sent to make things easy for people, you have not been sent to make things difficult.'" Translation Not Available

Book Ref: Sunan An Nisai Book 2 Hadith 330
Web Ref:  Sunan An Nisai Vol 1 Book 2 Hadith 331