Abu Dawud
Prescribed Punishments
Book Number: 033 / Hadith Number: 4390
Narated By Atiyyah al-Qurazi : 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.