The Family Of Imran - 3:65
O people of the Book, why do you dispute about Abraham, when the Injeel and the Torah were sent down after him? Do you not use your intellect?
What was the dispute of the people of the Book about Abraham?
The Cow/2:140
"Do you claim that Abraham, Ishmael, Isaac, Jacob and their descendants were Jews or Christians? Say: "Do you know better or Allah? Who is more unjust than he who conceals what Allah has revealed? Allah is not heedless of what you do."