Fighting for the Cause of Allah (Jihaad)

Bukhari :: Book 4 :: Volume 52 :: Hadith 240

Narrated Jabir bin 'Abdullah:

On the day of the battle of the Trench, the Prophet wanted somebody from amongst the people to volunteer to be a reconnoitre. Az-Zubair volunteered. He demanded the same again and Az-Zubair volunteered again. Then he repeated the same demand (thrice) and AzZubair volunteered once more. The Prophet then said, " Every prophet has a disciple and my disciple is Az-Zubair."