Fighting for the Cause of Allah (Jihaad)

Bukhari :: Book 4 :: Volume 52 :: Hadith 295

Narrated Ibn 'Abbas:

A man came to the Prophet and said, "O Allah's Apostle! I have enlisted in the army for such-and-such Ghazwa, and my wife is leaving for Hajj." Allah's Apostle said, "Go back and perform Hajj with your wife."