The Koran Confirms All the Earlier Books. The People of the Book Also Are Responsible toward the Koran

He has sent down the Book to you with truth, confirming what was there before it. And He sent down the Torah and the Gospel,
(Koran, 3:3)

Our Christian brothers must note the following point: Obeying the Koran and believing in the Prophet Muhammad will not deprive Christians of Jesus. On the contrary, it will bring them even closer to this blessed prophet. Someone who reads and accepts the Koran will become both a perfect Christian, and a perfect Jew, and a perfect follower of Joseph and a perfect follower of Noah and of Abraham and of Muhammad. He will accept all the prophets and embrace them and thus become an immaculate believer. The existence of the Koran, which shows them the truth and confirms their own books and which is a great source of guidance for them, and the fact that it has never changed, is also a great blessing for the People of the Book.

Indeed, in one verse God speaks of the existence of the People of the Book who adhere to the Koran and tells them of a reward in His Presence in the hereafter:

Among the people of the Book there are some who have faith in God and in what has been sent down to you and what was sent down to them, and who are humble before God. They do not sell God’s signs for a paltry price. Such people will have their reward with their Lord. And God is swift at reckoning. (Koran, 3:199)

The evidence from the Koran should be evaluated in the light of these facts in the chapters that follow.

God is my Lord and your Lord so worship Him. That is a straight path.
(Koran, 3:51)