وَعَنْ أَنَسِ بْنِ مَالِكٍ رضى الله عنه
قَالَ: «جَاءَ أَعْرَابِيٌّ فَبَالَ فِي طَائِفَةِ اَلْمَسْجِدِ، فَزَجَرَهُ اَلنَّاسُ، فَنَهَاهُمْ اَلنَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ (فَلَمَّا قَضَى بَوْلَهُ أَمَرَ اَلنَّبِيُّ) صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بِذَنُوبٍ مِنْ مَاءٍ; فَأُهْرِيقَ عَلَيْهِ»
Narrated Anas ibn Malik (rad): A Bedouin came and urinated in one corner of the mosque and the people shouted at him, but the Messenger of Allah (sallallahu alayhi wa sallam) stopped them, and when he finished urinating, the Prophet (sallallahu alayhi wa sallam) ordered for a bucket of water which was spilt over it.
Bulugh al-Maram 15, Book 1, The Book of Purification, Hadith 15. 1 min read