Fighting for the Cause of Allah (Jihaad)

Bukhari :: Book 4 :: Volume 52 :: Hadith 100

Narrated Jabir bin 'Abdullah:

When the Prophet called the people (Sadqa, a sub-narrator, said, 'Most probably that happened on the day of Al-Khandaq) Az-Zubair responded to the call (i.e. to act as a reconnoiter). The Prophet) called the people again and Az-Zubair responded to the call. The Prophet then said, "Every prophet had a disciple and my disciple is Zubair bin Al-'Awwam."