Chapter 3: Surat Aal-'Imran (The House 'Imran), verse 64-71

Translation:
Say: 'People of the Book, let us come to an agreement: that we will worship none but God, that we will associate none with Him, and that none of us shall set up mortals as deities besides God.' People of the Book, why do you argue about Abraham when both the Torah and the Gospel were not revealed till after him? Have you no sense? Indeed, you have argued about things of which you have some knowledge. Must you now argue about that of which you know nothing at all? God knows, but you know not. Abraham was neither Jew nor Christian. He was an upright man, one who submitted to God. He was no idolater. Surely the men who are nearest to Abraham are those who follow him, this Prophet, and the true believers. God is the guardian of the faithful. Some of the People of the Book wish to mislead you; but they mislead none but themselves, though they may not perceive it. People of the Book! Why do you deny God's revelations when you know that they are true? People of the Book! Why do you confound the true with the false, and knowingly hide the truth? (64-71)
Commentary:
Monotheism
is not only the original teachings of the Prophet but even in the interpolated
versions of the Torah and the Bible it is enshrined as an established reality.
Judged on this established criterion Islam is proved to be a completely true
religion rather than Judaism and Christianity. Monotheism implies belief in only
one God. He alone should be worshipped. No one should be associated with Him. No
man should be accorded the special place which is the prerogative of only the
Lord of the Universe. This concept of monotheism is preserved in its pure form
only in Islam in the Qur’an. Other religions accepting monotheism,
ideologically, adopted almost everything that ran counter to it. While believing
in God as sustainer they in practice accorded that status to their saints.