Full Sharh — Sahih al-Bukhari 4097
حَدَّثَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنْ عُبَيْدِ اللَّهِ، قَالَ أَخْبَرَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما أَنَّ النَّبِيَّ صلى الله عليه وسلم عَرَضَهُ يَوْمَ أُحُدٍ وَهْوَ ابْنُ أَرْبَعَ عَشْرَةَ فَلَمْ يُجِزْهُ، وَعَرَضَهُ يَوْمَ الْخَنْدَقِ وَهْوَ ابْنُ خَمْسَ عَشْرَةَ فَأَجَازَهُ.
English Translation
Narrated Ibn `Umar: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
Source
Sahih al-Bukhari(صحيح البخاري)
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Hadith Number
4097