(2:83) Remember that We made a solemn covenant with the children of Israel to this effect: worship none save Allah: be good to your parents, to your relatives, to the orphans and to the helpless; speak aright with the people: establish the Salat and pay the Zakat. But with the exception of a few, you all slid back from it and are paying no heed to it even now.
(2:208) O Believers, enter completely into Islamand do not follow in the footsteps of Satan, for he is your avowed enemy. God demands that man should submit, without reservation, the whole of his being to His will. Man's outlook, intellectual pursuits, behaviour, interaction with other people and modes of endeavour should all be completely subordinate to Islam. God does not accept the splitting up of human life into separate compartments, some governed by the teachings of Islam and others exempt. (Tafheemul Quran)