People who used to devotedly follow the existing core lessons of the Tawrah & the Injil finally accepted the Al-Quran as the final Book from God !

Verses 120-121 of Chapter 2
The Jews and the Christians will never be satisfied with you (O Muhammad), until you follow their way. Tell them plainly, "The right way is shown by Allah." And if, after all the' knowledge you have received, you were to yield to their desires, you shall find neither any friend nor helper to protect you from Allah's wrath. There are those, even among the people of the Scripture, who read the Book as it should be read and believe in it sincerely; as for those who reject it, they are indeed the losers.


Verses 68-69 of Chapter 5
Say: "O People of the Scripture! You have nothing till you act according to the Tawrah, the Injil, and what has (now) been sent down to you from your Lord (the Qur'an).'' Verily, the revelation that has come to you from your Lord makes many of them increase in rebellion and disbelief. So do not grieve for the people who disbelieve. Surely, those who believe, and those who are the Jews and the Sabians and the Christians, whosoever believed in Allah and the Last Day, and worked righteousness, on them shall be no fear, nor shall they grieve.

 

Verses 82-86 of Chapter 5
You will find that the most hostile of all people in their enmity to the Believers are the Jews and the mushriks; and you will find that the nearest in friendliness to the Believers are those, who say, "We are Christians." This is because there are among them some pious scholars and monks and because they are free from pride. When they listen to that which has been sent down to the Messenger, you see their eyes overflow with tears because of the Truth they recognize therein. They spontaneously say, "Our Lord, we have believed; therefore, write down our names with those who bear witness to it." And they say, "Why should we not believe in Allah and accept the Truth that has come to us, when we are eager that our Lord may count us with the righteous people?" And, for these words of theirs, Allah rewarded them with the Gardens underneath which canals flow, wherein they will live for ever. This is the reward of the righteous people. As for those who rejected Our Revelations and treated them as false, they deserve Hell.