Hadith: Every prophet had a disciple and my disciple is Az-Zubayr

عن جابر رضي الله عنهما قال: قال النبي صلى الله عليه وسلم : «مَن يأتيني بخبر القوم؟» يوم الأحزاب. قال الزُّبير: أنا، ثم قال: «مَن يأتيني بخبر القوم؟»، قال الزُّبير: أنا، فقال النبي صلى الله عليه وسلم : «إنَّ لكل نبي حَوَاريًّا، وحَوَاريِّ الزُّبير».
[صحيح] - [متفق عليه]

Jābir (may Allah be pleased with him) reported: The Prophet (may Allah's peace and blessings be upon him) said on the day of the battle of Ahzāb: "Who will bring me information about the enemy?" Az-Zubayr said: "I will." The Prophet (may Allah's peace and blessings be upon him) said again: "Who will bring me information about the enemy?" Once again Az-Zubayr said: "I will." Thereupon, the Prophet (may Allah's peace and blessings be upon him) said: "Every prophet had a disciple and my disciple is Az-Zubayr."
[Authentic hadith] - [Narrated by Bukhari & Muslim]

Explanation

In the run-up to the battle of the Ahzāb, as Quraysh and other tribes marched to Madīnah to fight the Muslims, and the Prophet (may Allah's peace and blessings be upon him) had dug the trench, news reached the Muslims that the Jewish tribe of Banu Qurayzhah had breached the covenant between them and the Muslims and allied with Quraysh in the fight against the followers of Islam. At this point, the Prophet (may Allah's peace and blessings be upon him) asked: “Who will bring me information on Banu Qurayzhah?” Az-Zubayr ibn al-‘Awwām (may Allah be pleased with him) said: “I will bring you the information.” The Prophet (may Allah's peace and blessings be upon him) repeated the question and Az-Zubayr made the same offer. Thereupon, the Prophet (may Allah's peace and blessings be upon him) said: “Each prophet had a helper, and my helper is Az-Zubayr.”