Fighting for the Cause of Allah (Jihaad)
Bukhari :: Book 4 :: Volume 52 :: Hadith 96
Narrated Zaid bin Khalid:
Allah's Apostle said, " He who pre pares a Ghazi going in Allah's Cause is given a reward equal to that of) a Ghazi; and he who looks after properly the dependents of a Ghazi going in Allah's Cause is (given a reward equal to that of) Ghazi."