It was narrated that Abu Hurairah said:
It was said: "O Messenger of Allah, we want to come to the mosque, but the path that we walk upon is impure." The Messenger of Allah said: "Some parts of the earth purify others." (IT)
English reference (IT): Vol. 1, Book 1, Hadith 532 (IT)
Arabic reference (IT): Book 1, Hadith 575 (IT)