Sahih al-Bukhari 3017 - The execution of the male captives and enslaving the women and children
The narrative appears in Sahih al-Bukhari, Sahih Muslim, Ibn Ishaq (the earliest biography of Muhammad), Ibn Hisham (editor of Ibn Ishaq) and al-Tabari (major early historian). This is not an "Islamophobic" fabrication—this is Islam's own history.
The hadith recounts the Prophet Muhammad endorsing Sa'd's judgment upon the Banu Qurayza, stating that "You have judged according to the ruling of the King (Allah)" or "You have judged with the judgment of Allah." This violent judgment was explicitly sanctioned as divine law by Muhammad. "You have judged by the judgment of Allah."
— Bukhari 3017
Ibn Ishaq (via Ibn Hisham) - Sīrah (biography of Muhammad) gives more details:
The Qurayza episode is one of the strongest historical and moral arguments against Muhammad's prophethood. A true prophet's moral fruit must match the character of God, and Jesus reveals God as "merciful and gracious, slow to anger." Muhammad's actions at Qurayza do not align with this revelation.