In their religious books...

In their religious books, even in the very heart of the Old Testament, they included tales and notions concerning Allah Most High that are no higher than the lowest concepts of the Greek and other idolatrous people who had never received any divinely-revealed book or message.

On the authority of the Qur'an, we know that their ancestor, Ibrahim (may Allah's peace be on him), expounded to his children the belief in the Oneness of Allah in a pure, luminous, complete, and comprehensive form in contrast to the prevalent paganism of the times. Similarly, his grandson, Y'aqub, prior to his death, imparted to his children the same beliefs. Allah says: And narrate to them the story of Ibrahim,…