Sayyiduna Atiyyah al-Qurazi (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) had ordered that everyone from Banu Qurayzah who had grown pubic hair be killed. I was a boy; they examined me and my hair had not grown, so they let me go.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14502