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Surah 13. Ar-Ra'd
Ayah 36 - 37
٣٦. وَٱلَّذِينَ ءَاتَيْنَـٰهُمُ ٱلْكِتَـٰبَ يَفْرَحُونَ بِمَآ أُنزِلَ إِلَيْكَ ۖ وَمِنَ ٱلْأَحْزَابِ مَن يُنكِرُ بَعْضَهُۥ ۚ قُلْ إِنَّمَآ أُمِرْتُ أَنْ أَعْبُدَ ٱللَّهَ وَلَآ أُشْرِكَ بِهِۦٓ ۚ إِلَيْهِ أَدْعُوا۟ وَإِلَيْهِ مَـَٔابِ
٣٧. وَكَذَٰلِكَ أَنزَلْنَـٰهُ حُكْمًا عَرَبِيًّا ۚ وَلَئِنِ ٱتَّبَعْتَ أَهْوَآءَهُم بَعْدَ مَا جَآءَكَ مِنَ ٱلْعِلْمِ مَا لَكَ مِنَ ٱللَّهِ مِن وَلِىٍّ وَلَا وَاقٍ
[36-37] O Prophet! some of those people whom We gave the Book before you rejoice in the Book We have sent down to you while there are others among the different sections who reject some of the things contained in this. Tell them plainly "I have been commanded to worship Allah alone and prohibited from setting up a partner with him. Therefore I invite you to Him and myself turn to Him."55 It is with this instruction that We have sent this Command in Arabic to you. Now if you follow the desires and lusts of the people in spite of the knowledge you have received there shall be none to defend you nor to protect you against Allah.
55This is in reply to a specific objection which was then raised by the disbelievers. They would say, "If he has brought the same Message that was brought by the Messengers before him (as he claims). why don't the Jews and the Christians who are the followers of the former Prophets come forward and welcome it?" The verse answers the objection and says that the taste followers of the former Prophets really rejoice in the Message of the Qur'an, but the false ones have been offended at it. Then it asks the Holy Prophet not to worry at all about this, saying, "O Prophet, you should not mind at all whether they are pleased or offended at it. Tell them plainly that this is the Guidance I have received from my Lord and I will follow it at all costs."