Musannaf Ibn Abi Shayba 36:285

'Abd al-Rahim ibn Sulayman narrated to us, from Hisham, from his father, that the Messenger of Allah (may Allah bless him and grant him peace) said on the day of the Trench: "Who is a man who will go and bring us news of Banu Qurayza?" Al-Zubayr rode off and brought him their news, then he returned. He (the Prophet) said three times: "Who will bring me their news?" Al-Zubayr said: "Yes." The Prophet (may Allah bless him and grant him peace) combined his parents for Al-Zubayr, saying: "May my father and mother be ransomed for you." And he said to Al-Zubayr: "Every prophet has a disciple (hawari), and my disciple is Al-Zubayr, the son of my paternal aunt."