‘Urwah (rahimahullah) narrates that Hazrat ‘Abdullah bin Zubair (radhiyallahu ‘anhu) said, “During the battle of Ahzaab (also known as the Battle of Khandaq), ‘Umar bin abi Salamah (radhiyallahu ‘anhu) and I were made to remain back with the women in the fortress of Hassaan (radhiyallahu ‘anhu). We would then take turns to lift one another so that we could see out of the fort. When I looked out of the fort, I saw Hazrat Zubair (radhiyallahu ‘anhu) astride his horse, going and returning from the Banu Quraizah two or three times. After he returned, I said to him, “O my father! I saw you going back and forth.” In reply, Hazrat Zubair (radhiyallahu ‘anhu) asked, “O my son! Did you really see me?” When I replied that I had seen him, he said, “Rasulullah (sallallahu ‘alaihi wasallam) had asked, ‘Who will go to the Banu Quraizah and bring information to me regarding them?” I responded to the request of Rasulullah (sallallahu ‘alaihi wasallam) and immediately set out for the Banu Quraizah. On my return, Rasulullah (sallallahu ‘alaihi wasallam) gathered both his parents in the du‘aa he made for me saying, “May my father and mother be sacrificed for you!”

(Saheeh Bukhaari #3720, Siyar A’laam min Nubalaa 3/32)