Original sentence: A combination of the willingness of the Jews to negotiate with Muhammad, and Muhammad's inability to communicate with Khaybar, caused Muhammad to send emissaries to Khaybar, inviting them to Medina to parley.A quarrel broke out between parties, in which Unays was wounded, and all but one member of the Jewish delegation were killed.It has been recorded by one source  that Usayr also approached the Ghatafan and rumors spread that he intended to attack the "capital of Muhammad".On the way, Unays, a Muslim, became suspicious of Usayr, who tried once or twice to grab Unays's sword.Usayr along with thrity tribesmen set off to Medina, unarmed.Usayr ibn Zarim was the war chief of the Banu Nadir, who succeeded Abu al-Rafi ibn Abu al-Huqayqupon his death.Watt and Nomani both speculate that it is probable that Usayr changed his mind about the negotiations
Edited sentence: 665-666</rev>.<ref>I.Guillaume, pg.His companions stole into Khaybar at night and assassinated Abu al-Rafi ibn Abi al-Huqayq, one of the Khaybar chieftains.In his preparations for the attack, Muhammad took steps to eliminate some of the more antagonizing leaders of the Jews of Khaybar.In the end, all but one were killed, Usayr being one of the killed.Ishaq, A.Later, seeing the willingness of the Jews to negotiate with him, Muhammad sent envoys to Khaybar inviting Usayr ibn Zarim, the war chief of Banu Nadir, to come to Medina for talks which he accepted.Six miles out from Khaybar, Usayr changed his mind and instead drew his sword against the leading Muslim Abdullah bin Rawaha and so a heated scuffle broke out.Umayr and thirty his companions set off to Medina with Muhammad's emissaries.Usayr ibn Zarim was the war chief of the Banu Nadir, who succeeded Abu al-Rafi ibn Abu al-Huqayq who was assassinated