Volume 5, Book 57, Number 67:
Narrated ‘Urwa:
On the day of the battle of Al-Yarmuk, the companions of the Prophet said to Az-Zubair, “Will you
attack the enemy vigorously so that we may attack them along with you?” So Az-Zubair attacked
them, and they inflicted two wounds over his shoulder, and in between these two wounds there was
an old scar he had received on the day of the battle of Badr When I was a child, I used to insert my
fingers into those scars in play.