Narrated Anas bin Malik:

A bedouin urinated in the mosque and the people ran to (beat) him. Allah's Apostle ﷺ said, "Do not interrupt his urination (i.e. let him finish)." Then the Prophet asked for a tumbler of water and poured the water over the place of urine.

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ عَبْدِ الْوَهَّابِ، حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، عَنْ ثَابِتٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ أَعْرَابِيًّا، بَالَ فِي الْمَسْجِدِ، فَقَامُوا إِلَيْهِ، فَقَالَ رَسُولُ اللَّهِ ﷺ " لا تُزْرِمُوهُ ". ثُمَّ دَعَا بِدَلْوٍ مِنْ مَاءٍ فَصُبَّ عَلَيْهِ.