The obligation to wash away urine and other impurities if they result in the Masjid, and the ground may be purified with water with no need to scrub it

Sahih Muslim · Book 2 · Hadith 284a

وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا حَمَّادٌ، - وَهُوَ ابْنُ زَيْدٍ - عَنْ ثَابِتٍ، عَنْ أَنَسٍ، أَنَّ أَعْرَابِيًّا، بَالَ فِي الْمَسْجِدِ فَقَامَ إِلَيْهِ بَعْضُ الْقَوْمِ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ دَعُوهُ وَلاَ تُزْرِمُوهُ ‏"‏ ‏.‏ قَالَ فَلَمَّا فَرَغَ دَعَا بِدَلْوٍ مِنْ مَاءٍ فَصَبَّهُ عَلَيْهِ ‏.‏

Anas reported: A Bedouin urinated in the mosque. Some of the persons stood up (to reprimand him or to check him from doing so), but the Messenger of Allah (ﷺ) said: Leave him alone; don't interrupt him. He (the narrator)…

Sahih Muslim · Book 2 · Hadith 284b

حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ الْقَطَّانُ، عَنْ يَحْيَى بْنِ سَعِيدٍ الأَنْصَارِيِّ، ح وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، وَقُتَيْبَةُ بْنُ سَعِيدٍ، جَمِيعًا عَنِ الدَّرَاوَرْدِيِّ، - قَالَ يَحْيَى بْنُ يَحْيَى أَخْبَرَنَا عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدٍ الْمَدَنِيُّ، - عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّهُ سَمِعَ أَنَس…

Anas b. Malik narrated that a desert Arab (Bedouin) stood in a corner of the mosque and urinated there. The people (the Companions of the Prophet (ﷺ) who were present there) shouted, but the Messenger of Allah (ﷺ) said:…