Prior to the coming of Rasulullah to Madinah the tribes of Aus and Khazraj were always quarreling with each other and they felt harmony and peaceful co-existence should be maintained between the people of Madinah. They were keen to have a common ruler.
Abdullah bin Ubay bin Sulool a citizen of Madinah was a very intelligent, experienced in worldly matters, clever and cunning person. He had great influence over the Aus and Khazraj tribes and the people of Madinah accepted his leadership, and were prepared to crown him king and ruler of Madinah.
He foresaw himself as a future king and ruler of Madinah. After Rasulullah and his followers entered Madinah they became a strong force and the people of Madinah accepted the leadership of Rasulullah. This shattered the hopes of Abdullah bin Ubay bin Sulool of becoming the ruler of Madinah.
Abdullah bin Ubay bin Sulool hoped that if Rasulullah had not come to Madinah he would have been installed as ruler of the city.
Being a clever and cunning person, he hid his dislike and hatred for Rasulullah and his followers accepted Islam to show everyone that they were Muslims but at heart they were dangerous enemies of Islam and they co-operated with the Jews in plotting against the Muslims.
The Jews found friends in these people as they had feared that they will lose control of the business of Madinah.
Abdullah bin Ubay bin Sulool and his followers are termed 'Munafiqs' (Hypocrites) in Islam.
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