Qurayza tribe massacre...
The siege of Banu Qurayza took place in Dhul Qa‘dah during January of 627 CE and followed on from the Battle of the Trench.The Banu Qurayza, a Jewish tribe that once lived in Medina, though allied with the Muslims and even lent them equipment to dig the trench during the Battle of the Trench, refused to fight in the battle as they were offended by Muhammad's attacks on Jews.