بُلُوغُ الْمَرَامِ
Bulugh al-Maram 868
Business Transactions
وَعَنِ اِبْنِ عُمَرَ -رَضِيَ اَللَّهُ عَنْهُمَا- قَالَ: { عُرِضْتُ عَلَى اَلنَّبِيِّ - صلى الله عليه وسلم -يَوْمَ أُحُدٍ, وَأَنَا اِبْنُ أَرْبَعَ عَشْرَةَ سَنَةً, فَلَمْ يُجِزْنِي, وَعُرِضْتُ عَلَيْهِ يَوْمَ اَلْخَنْدَقِ, وَأَنَا اِبْنُ خَمْسَ عَشْرَةَ سَنَةً, فَأَجَازَنِي } مُتَّفَقٌ عَلَيْهِ [1] .
Narrated Ibn 'Umar (RA): I was brought before the Prophet (ﷺ) on the Day of Uhud when I Was fourteen years old, but he did not give me permission (to fight). I was afterwards brought to him on the Day of al-Khandaq (the Battle of Trench) when I was fifteen years of age, and he gave me permission (to fight). [Agreed upon].
Sunnah.com reference: Book 7, Hadith 109