Sunan an-Nasa'i 56
It was narrated that Abu Hurairah said:
"A Bedouin stood up and urinated in the Masjid, ans the people started shouting. The Messenger of Allah (ﷺ) said to them: 'Leave him alone, and spill 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.'"
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 ‏"‏ ‏.‏