"I heard 'Imran bin Husain (say) that the Prophet ﷺ saw a man who was by himself and did not pray with the people. He said: 'O So and so, what kept you from praying with the people?' He said: 'O Messenger of Allah, I have become Junub and there is no water.' He said: 'You should use earth for that will suffice you.'"  

أَنَّ رَسُولَ اللَّهِ ﷺ رَأَى رَجُلاً مُعْتَزِلاً لَمْ يُصَلِّ مَعَ الْقَوْمِ فَقَالَ يَا فُلاَنُ مَا مَنَعَكَ أَنْ تُصَلِّيَ مَعَ الْقَوْمِ فَقَالَ يَا رَسُولَ اللَّهِ أَصَابَتْنِي جَنَابَةٌ وَلاَ مَاءَ قَالَ عَلَيْكَ بِالصَّعِيدِ فَإِنَّهُ يَكْفِيكَ