Hadithcore
Mishkat al-Masabih, 3794

Abu ‘Abs reported God’s Messenger as saying, “No man whose feet become dusty in God’s path will be touched by hell.” Bukhari transmitted it.

وَعَن أبي عَبْسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَا اغْبَرَّتْ قَدَمَا عَبْدٍ فِي سَبِيلِ الله فَتَمَسهُ النَّار» . رَوَاهُ البُخَارِيّ

References1 variant
In-Book Reference
Book 19, Hadith 8