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."
قِيلَ يَا رَسُولَ اللَّهِ إِنَّا نُرِيدُ الْمَسْجِدَ فَنَطَأُ الطَّرِيقَ النَّجِسَةَ فَقَالَ رَسُولُ اللَّهِ ﷺ الأَرْضُ يُطَهِّرُ بَعْضُهَا بَعْضًا