They uncovered my private parts, and when they found that the hair had not begun to grow they put me among the captives.
Sunan Abi Dawud Book 40, Hadith 55
← Previous Hadith I was among the captives of Banu Qurayzah. They (the Companions) examined us, and those who had begun to grow hair (pubes) were killed, and those who had not were not killed. I was among those who had not grown hair.

Sunan Abi Dawud Book 40, Hadith 54 Next Hadith → 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.

Sunan Abi Dawud Book 40, Hadith 56