Sahih Muslim 522 a
Hudhaifa reported:
The Messenger of Allah (may peace be npon him) said: We have been made to excel (other) people in three (things): Our rows have been made like the rows of the angels and the whole earth has been made a mosque for us, and its dust has been made a purifier for us in case water is not available. And he mentioned another characteristic too
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا مُحَمَّدُ بْنُ فُضَيْلٍ، عَنْ أَبِي مَالِكٍ الأَشْجَعِيِّ، عَنْ رِبْعِيٍّ، عَنْ حُذَيْفَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏
"‏ فُضِّلْنَا عَلَى النَّاسِ بِثَلاَثٍ جُعِلَتْ صُفُوفُنَا كَصُفُوفِ الْمَلاَئِكَةِ وَجُعِلَتْ لَنَا الأَرْضُ كُلُّهَا مَسْجِدًا وَجُعِلَتْ تُرْبَتُهَا لَنَا طَهُورًا إِذَا لَمْ نَجِدِ الْمَاءَ ‏"‏ ‏.‏ وَذَكَرَ خَصْلَةً أُخْرَى ‏.‏