Hadith 907
Narrated Abu `Abs: I heard the Prophet saying, "Anyone whose feet are covered with dust in Allah's cause, shall be saved by Allah from the Hell-Fire."
Hadith 2811
Narrated Abu `Abs: (who is `Abdur-Rahman bin Jabir) Allah's Apostle said," Anyone whose both feet get covered with dust in Allah's Cause will not be touched by the (Hell) fire."