Tirmidhi Book 1, Hadith 147

حَدَّثَنَا ابْنُ أَبِي عُمَرَ،‏‏‏‏ وَسَعِيدُ بْنُ عَبْدِ الرَّحْمَنِ الْمَخْزُومِيُّ،‏‏‏‏ قَالَا:‏‏‏‏ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ الزُّهْرِيِّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ:‏‏‏‏ دَخَلَ أَعْرَابِيٌّ الْمَسْجِدَ وَالنَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ جَالِسٌ فَصَلَّى، ‏‏‏‏‏‏فَلَمَّا فَرَغَ، ‏‏‏‏‏‏قَالَ:‏‏‏‏ اللَّهُمَّ ارْحَمْنِي وَمُحَمَّدًا وَلَا تَرْحَمْ مَعَنَا أَحَدًا، ‏‏‏‏‏‏فَالْتَفَتَ إِلَيْهِ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ، ‏‏‏‏‏‏فَقَالَ:‏‏‏‏ لَقَدْ تَحَجَّرْتَ وَاسِعًا ،‏‏‏‏ فَلَمْ يَلْبَثْ أَنْ بَالَ فِي الْمَسْجِدِ فَأَسْرَعَ إِلَيْهِ النَّاسُ، ‏‏‏‏‏‏فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ:‏‏‏‏ أَهْرِيقُوا عَلَيْهِ سَجْلًا مِنْ مَاءٍ أَوْ دَلْوًا مِنْ مَاءٍ ثُمَّ قَالَ:‏‏‏‏ إِنَّمَا بُعِثْتُمْ مُيَسِّرِينَ وَلَمْ تُبْعَثُوا مُعَسِّرِينَ .

Abu Hurairah narrated: A Bedouin entered the Masjid while the Prophet was sitting. He prayed, then when he was finished, he said: 'O Allah! Have mercy upon me and Muhammad, and do not have mercy on anyone along with us.' The Prophet turned, towards him and said: 'You have restricted something that is unrestricted.' It was not long before he was urinating in the Masjid. So the people rushed to him. But Prophet said: 'Pour a bucket of water over it - or - a tumbler of water over it.' Then he said: 'You have been sent to make things easy (for the people); you have not been sent to make things difficult for them.'