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Rabbani (rabbi) was the title of a religious functionary who guided the religious affairs of the Jews, established worship and expounded law.
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These two verses are a comprehensive refutation of all the wrong things that different people have ascribed to their Prophets and entered into their Books in order to make an angel or a Prophet a god and an object of worship. Here a fundamental formula has been laid down: anything that teaches the worship of anyone other than Allah and raises a servant of God to the high pedestal of Godhead can never be the teaching of any Messenger of God: therefore the very existence of such a thing in any book should be taken as a clear proof of its being a later insertion by some misguided people. Hence the claim "to be the son of God and equal with God," could never have been made by Jesus himself, but by some misguided followers of his.