 According to Muslim sources, Muhammad returned to the Jews copies of the Torah seized during the siege, since he opposed desecrating them.After captives of war and slaves from other countries were brought to Khaybar and the people of Hejaz became more accustomed to agriculture, the caliph Omar decided to expel the Jews of Khaybar in 642 under the pretense that before his death Muhammad had commanded that two religions could not exist simultaneously in the Hejaz.In 627, Muhammad also ordered the Expedition of Fadak to attack the Bani Sa‘d bin Bakr tribe, because Muhammad received intelligence they were planning to help the Jews of Khaybar.