Sunan Abi Dawud 4406
سنن أبي داود#4406SahihIbn ‘Umar said: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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Bukhari (4097) Sahih Muslim (1868)
In-book reference: 40:56