Sahih Al Bukhari (220)

حَدَّثَنَا أَبُو اليَمَانِ، قَالَ: أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، قَالَ: أَخْبَرَنِي عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ بْنِ عُتْبَةَ بْنِ مَسْعُودٍ، أَنَّ أَبَا هُرَيْرَةَ، قَالَ: قَامَ أَعْرَابِيٌّ فَبَالَ فِي المَسْجِدِ، فَتَنَاوَلَهُ النَّاسُ، فَقَالَ لَهُمُ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: "دَعُوهُ وَهَرِيقُوا عَلَى بَوْلِهِ سَجْلًا مِنْ مَاءٍ، أَوْ ذَنُوبًا مِنْ مَاءٍ، فَإِنَّمَا بُعِثْتُمْ مُيَسِّرِينَ، وَلَمْ تُبْعَثُوا مُعَسِّرِينَ"

Abu Hurayrah (may Allah be pleased with him) narrated that a Bedouin stood up and started making water in the mosque. The people caught him but the Prophet (peace be upon him) ordered them to leave him and to pour a bucket or a tumbler of water over the place where he had passed the urine. The Prophet (peace be upon him) then said: "You have been sent to make things easy and not to make them difficult."