The Muslims tribes also became restless because they had...
The Muslims tribes also became restless because they had heard that some of the companions of the Prophet, because of party politics, were fighting one another for the position of the Caliphate. The disapproval of the relatives of the Prophet, Bani Hashim's, and the opposition of Sa‘d, the chief of the Khazraj tribe, to Abu Bakr as Caliph, caused some Muslim tribes to suspect the Caliphate office.
They did not renounce their faith, nor did they reject prayer, or object to paying tax, they only refused to pay the due tax to Abu Bakr's government. These opponents were called heretics and they were to be eliminated by wars, camouflaged as holy. After the destruction of their Muslim opponents, the government fought the pagan tribes and the false prophets and their organizations. Finally, expeditions were sent outside Arabia.
All those battles fought in Abu Bakr's time, were called Reddah, (war against heretics). So the Muslim opponents of Abu Bakr outside Medina, were called ‘Mortaddin' (Heretics). Dr.
Hassan Ebrahim supported this idea in his book The History of Islamic Politics page 251 reads — "After the Prophet of God passed away and his death was confirmed, some Muslims hesitated about the truth of Islam, and some were afraid that the Quraish, or indeed any other tribe, could come to power and form a dictator state.
They had realized that only the Prophet of God was infallible, and any other person who succeeded him, would not have the characteristic, which allowed him to treat all men, like the teeth of a comb, as equals. Therefore they suspected, that if the successor of the Prophet favored his own family and tribe, and under- estimated the other tribes, it would destroy Islamic social justice.
We guess this because we see that, after the Prophet, each Arab selfishly supported his own family tribe, and the Arab's old natural way, returned. In Medina the Ansars (Helpers) were afraid that the Muhajirs (Immigrants) and the Quraish tribe would come to power. These two were suspicious of each other. The Ansars wanted a coalition government. The Muhajirs wanted the chief to be from their tribe, and the assistant chief from the Ansars.
The Aws and Khazraj — sub-divisions of the Ansars, betrayed each other during the election of the Caliph. "Mecca was no better than Medina as the election caused tribal conflict there as well.