It is narrated from Hazrat Yazid bin Asam that when Allah Almighty drove away the armies and the Noble Prophet (peace and blessings be upon him) returned to his home, and he (peace and blessings be upon him) began to wash his blessed head, Gabriel came to him and said: May Allah forgive you. You have put down your weapons, while the angels of the heavens have not put down their weapons? Please come with us to the fortress of Banu Qurayza. So the Noble Prophet (peace and blessings be upon him) announced among the people to proceed to the fortress of Banu Qurayza. Then he (peace and blessings be upon him) performed ghusl (ritual bath) and he (peace and blessings be upon him) also went with the people to the fortress.