Fighting for the Cause of Allah (Jihaad)

Bukhari :: Book 4 :: Volume 52 :: Hadith 184

Narrated 'Abdullah bin Abi Aufa:

Allah's Apostle invoked evil upon the pagans on the ay (of the battle) of Al-Ahzab, saying, "O Allah! The Revealer of the Holy Book, the Swift-Taker of Accounts, O Allah, defeat Al-Ahzab (i.e. the clans), O Allah, defeat them and shake them."