Sayyiduna Atiyyah al-Qurazi (may Allah be pleased with him) said: We were presented before the Messenger of Allah (peace and blessings be upon him) at the time of Qurayzah, and whoever had reached puberty or whose pubic hair had grown, they would kill him. He said: They looked at me, and my hair had not grown, so they let me go.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحجر / 11317