That the Prophet ﷺ inspected him on the day of Uhud while he was fourteen years old, and the Prophet ﷺ did not allow him to take part in the battle. He was inspected again by the Prophet ﷺ on the day of Al- Khandaq (i.e. battle of the Trench) while he was fifteen years old, and the Prophet ﷺ allowed him to take Part in the battle.
أَنَّ النَّبِيَّ ﷺ عَرَضَهُ يَوْمَ أُحُدٍ وَهْوَ ابْنُ أَرْبَعَ عَشْرَةَ فَلَمْ يُجِزْهُ وَعَرَضَهُ يَوْمَ الْخَنْدَقِ وَهْوَ ابْنُ خَمْسَ عَشْرَةَ فَأَجَازَهُ