Sahih Bukhari | Volume 5 | Hadith Number 439

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.