Musannaf Ibn Abi Shayba 28:596

Waki' narrated to us, he said: Sufyan narrated to us, from 'Abd al-Malik ibn 'Umayr, he said: I heard 'Atiyyah al-Qurazi saying: We were presented to the Prophet, may Allah bless him and grant him peace, on the day of Qurayzah. Whoever had grown pubic hair was killed, and whoever had not grown pubic hair was let go.