In another narration, reported by the son of Hazrat ‘Urwah (rahimahullah), Hazrat Zubair (radhiyallahu ‘anhu) was the first person to draw his sword for the sake of Allah Ta‘ala. This narration further mentions that when Rasulullah (sallallahu ‘alaihi wasallam) heard this reply of Hazrat Zubair (radhiyallahu ‘anhu), he made du‘aa for him and for his sword.
Note: There are different narrations regarding the age of Hazrat Zubair (radhiyallahu ‘anhu) at the time of his accepting Islam. There are two different views that have been narrated from ‘Urwah (rahimahullah). Abul Aswad narrates from ‘Urwah (rahimahullah) that Hazrat Zubair (radhiyallahu ‘anhu) was twelve years old when he accepted Islam, and Hishaam bin ‘Urwah (rahimahullah) narrates from his father, ‘Urwah (rahimahullah), that he was sixteen years old. As for Hishaam bin ‘Urwah (rahimahullah), his view is that Hazrat Zubair (radhiyallahu ‘anhu) was fifteen years old when he accepted Islam. There is also a view of Hazrat Zubair (radhiyallahu ‘anhu) being eight years old at the time of accepting Islam. He accepted Islam shortly after Hazrat Abu Bakr (radhiyallahu ‘anhu).
(Siyar A’laam min Nubalaa 3/27, Usdul Ghaabah 2/210, Musannaf ‘Abdur Razzaaq #9647, Musannaf ibn Abi Shaibah #19869)