Narrated Ibn `Umar: Allah's Apostle called me to present myself in front of him or the eve of the battle of Uhud, while I was fourteen years of age at that time, and he did not allow me to take part in that battle, but he called me in front of him on the eve of the battle of the Trench when I was fifteen years old, and he allowed me (to join the battle)." Nafi said, "I went to `Umar bin `Abdul `Aziz who was Caliph at that time and related the above narration to him, He said, "This age (fifteen) is the limit between childhood and manhood," and wrote to his governors to give salaries to those who reached the age of fifteen.

Narrated Ibn `Umar: That the Prophet inspected him on the day of Uhud while he was fourteen years old, and the Prophet did not allow him to take part in the battle. He was inspected again by the Prophet on the day of Al- Khandaq (i.e. battle of the Trench) while he was fifteen years old, and the Prophet allowed him to take Part in the battle.