Musnad Ahmad 7:19

'Attab ibn Ziyad narrated to us, 'Abdullah—meaning Ibn al-Mubarak—narrated to us, Hisham ibn 'Urwah informed us, from his father, from 'Abdullah ibn al-Zubayr, who said: On the day of the Confederates (al-Ahzab), I and 'Umar ibn Abi Salamah were placed with the women. I looked, and there was al-Zubayr on his horse, going back and forth to the Banu Qurayzah twice or three times. When he returned, I said: "O my father, I saw you going back and forth." He said: "Did you see me, my son?" I said: "Yes." He said: "Indeed, the Messenger of Allah (may Allah bless him and grant him peace) said: 'Who will go to the Banu Qurayzah and bring me their news?' So I went. And when I returned, the Messenger of Allah (may Allah bless him and grant him peace) combined his parents for me and said: 'May my father and mother be ransomed for you.'"