Abu Lubaba ibn Abd al-Mundhir (Arabic: أبو لبابة بن عبد المنذر, romanized: Abū Lubāba ibn ʿAbd al-Mundhir) was a leading member of the Banu Aws, an Arabic tribe in Yathrib, today known as Medina.
The Qurayza had a long-standing alliance with the Aws and during the siege asked to confer with Abu Lubaba.
According to Ibn Ishaq, Abu Lubaba felt pity for the women and children of the tribe who were crying and when asked whether the Qurayza should surrender to Muhammad, advised them to do so.
Ibn Ishaq's account, going back to Abu Lubaba's own statements, related that he regretted his actions, stating: "My feet had not moved away from the spot before I knew I had been false to God and His Apostle".
[1] One early morning, Muhammad declared that God had forgiven him after reportedly receiving a revelation.