Sayyiduna Atiyyah al-Qurazi (may Allah be pleased with him) said: At the time of the event of Banu Qurayzah, I was presented before the Messenger of Allah (peace and blessings be upon him). The order was that whoever among us had reached puberty or had grown pubic hair was to be killed. They examined me and my pubic hair had not grown, so I was left.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14507