Ayyash bin 'Abbas al-Qanabi عياش بن عباس القتباني · Prescribed Punishments (Kitab Al-Hudud)

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.