Sunan an-Nasa'i 3429

It was narrated that Kathir bin As-Sa'ib said:"The sons of Quraizah told me that they were presented to the Messenger of Allah on the Day of Quraizah, and whoever (among them) had reached puberty, or had grown pubic hair, was killed, and whoever had not reached puberty and had not grown pubic hair was left (alive)