Hazrat Ibn Umar (may Allah be pleased with both of them) narrates that on the day of the Battle of Uhud, I was presented before the Messenger of Allah (peace and blessings be upon him) and at that time I was fourteen years old. The Prophet (peace be upon him) considered me too young and sent me back. On the day of the Battle of Khandaq, I was presented before the Prophet (peace be upon him) and at that time I was fifteen years old, so he granted me permission to participate in jihad.