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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."