It is narrated from Mujahid that Atiyyah, a man of Banu Qurayzah, informed him that the Companions of the Messenger of Allah (peace and blessings be upon him) removed his clothes on the day of Qurayzah and examined him (for hair), and they saw that no razor had yet passed over his pubic hair (that is, he had not yet reached puberty), so they spared him from being killed. Thus, through the corroboration (mutaba'ah) of Mujahid, this hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.