He was presented before the prophet (ﷺ) on the day of Uhd when he was fourteen years old, but he did not allow him (to participate in the battle). He was again presented before him on the day of Khandaq when he was fifteen years old, Then he allowed him.

When I mentioned this tradition to ‘Umar.b.’Abd al-Aziz he said : This prescribed punishment is between the minor and the major.