Banu Khazraj made it preferable for the former to instead submit to the Qurayshite rule. Momen has a similar opinion, and Ayoub regards the rivalry between the Banu Khazraj and the Banu Aws as the decisive factor in the appointment of Abu Bakr, who reportedly reminded the Ansar about this rivalry in the Saqifa account of the Sunni al-Jahiz (), thus rekindling their pre-Islamic conflict, according to Ayoub. Banu Khazraj The position of the Banu Khazraj was further weakened by internal rivalries, particularly between their chief Sa'd ibn Ubada and his cousin Bashr ibn Sa'd. The latter was among the first to break ranks and support Abu Bakr. Once an agreement over Abu Bakr was nearly reached, Jafri believes that the Khazraj found it unwise to lag behind and risk losing favor with the new ruler. Banu Taym Jafri suggests that the rivalries among the larger clans within the Muhajirun made it easier for them to accept the rule of Abu Bakr, who belonged to the small clan of Banu Taym. Banu Aslam Madelung and Caetani both hold that a decisive factor for Abu Bakr was the timely arrival of the Banu Aslam tribe in Medina with great numbers that filled the streets of Medina. The Banu Aslam tribe were known for their hostility towards the Ansar and readily supported Abu Bakr's bid for power. Umar would often point out, "It was only when I saw the Banu Aslam that I became certain of [our] victory." It is not known today whether this happened by chance or the Banu Aslam were tipped off about the Ansar's ambitions. Banu Hashim Jealousy Muhammad's clan, the Banu Hashim, and particularly his notable uncle Abbas supported the succession of Ali. Aslan suggests that the exclusion of Ali from the Saqifa affair was deliberate and reflected the fear among the Quraysh that combining the prophethood and the caliphate in the Banu Hashim would have made them too powerful. A conversation to this effect between the Hashemite Ibn Abbas and Umar is cited by Momen and Madelung. The former author voices a similar view to Aslan, while the latter acknowledges the "jealousy of the Quraysh," but believes that the simple logic of dynastic succession would have nevertheless prevailed in a broad in favor of Ali. For Keaney, the Meccan elite were concerned that Ali's caliphate would have kept the future leadership of the community out of