It was narrated that Wathilah bin Asqa' said:
"A Bedouin came to the Prophet and said: 'O Allah, have mercy on me and Muhammed, and do not allow anyone else to share in your Mercy.' The Prophet ﷺ said: 'You have placed restrictions on something that is vast, woe to you!' Then he (the Bedouin) spread his legs and urinated, and the Companions of the Prophet told him to stop, but the Messenger of Allah said: 'Let him be,' then he called for a vessel of water and poured it over (the urine)."

حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى، حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ، عَنْ عُبَيْدِ اللَّهِ الْهُذَلِيِّ، - قَالَ مُحَمَّدُ بْنُ يَحْيَى وَهُوَ عِنْدَنَا ابْنُ أَبِي حُمَيْدٍ - أَنْبَأَنَا أَبُو الْمَلِيحِ الْهُذَلِيُّ، عَنْ وَاثِلَةَ بْنِ الأَسْقَعِ، قَالَ جَاءَ أَعْرَابِيٌّ إِلَى النَّبِيِّ ـ ﷺ ـ فَقَالَ اللَّهُمَّ ارْحَمْنِي وَمُحَمَّدًا وَلاَ تُشْرِكْ فِي رَحْمَتِكَ إِيَّانَا أَحَدًا . فَقَالَ " لَقَدْ حَظَرْتَ وَاسِعًا وَيْحَكَ - أَوْ وَيْلَكَ - " . قَالَ فَشَجَ يَبُولُ فَقَالَ أَصْحَابُ النَّبِيِّ ـ ﷺ ـ مَهْ . فَقَالَ رَسُولُ اللَّهِ ـ ﷺ ـ " دَعُوهُ " . ثُمَّ دَعَا بِسَجْلٍ مِنْ مَاءٍ فَصَبَّ عَلَيْهِ .