During the period before the Hijra, Abū Qays al-Aslat of the clan of Wāʼil, the leader of Aws, gave away the leadership to Ḥuḍayr bin Simāk of ʻAbd al-Ashhal. After a serious defeat, ʻAbd al-Ashhal and Ẓafar were withdrawn from Yathrib. The opposing leader, ʻAmr bin Nuʻmān, of the Khazrajite clan of Bayāḍa, drove the Jews tribes of Banu Qurayza and Banu Nadir into alliance of the two.[1] Nomads of Muzayna joined them too.