Anyone whose feet get covered with dust in the cause of Allah will not be touched by Hellfire. [Al-Bukhari]
": «ما اغْبَرَّتْ قَدَمَا عَبْدٍ في سَبِيل الله فَتَمَسَّهُ النَّار». [صحيح.] - [رواه البخاري.]"