Sahih Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Volume: 005 / Book Number: 059 / Hadith Number: 439
Narrated Jabir:
On the day of Al-Ahzab (i.e. clans), Allah's Apostle said, 'Who will bring us the news of the people (i.e. the clans of Quraish infidels)?" Az-Zubair said, "I." The Prophet again said, "Who will bring us the news of the people?" AzZubair said, "I." The Prophet again said, "Who will bring us the news of the people?" Az-Zubair said, "I." The Prophet then said, "Every prophet has his Hawari (i.e. disciple-special helper); my disciple is Az-Zubair.