Quran 2:120 from Surah Al-Baqara on Divine Marvels.
وَلَن تَرۡضَىٰ عَنكَ ٱلۡيَهُودُ وَلَا ٱلنَّصَٰرَىٰ حَتَّىٰ تَتَّبِعَ مِلَّتَهُمۡۗ قُلۡ إِنَّ هُدَى ٱللَّهِ هُوَ ٱلۡهُدَىٰۗ وَلَئِنِ ٱتَّبَعۡتَ أَهۡوَآءَهُم بَعۡدَ ٱلَّذِي جَآءَكَ مِنَ ٱلۡعِلۡمِ مَا لَكَ مِنَ ٱللَّهِ مِن وَلِيّٖ وَلَا نَصِيرٍ
English translation: And never will be pleased with you the Jews and [not] the Christians until you follow their religion Say Indeed (the) Guidance (of) Allah it (is) the Guidance And if you follow their desires after what has come to you of the knowledge not for you from Allah any protector and not any helper
Transliteration: walan tarda anka al-yahudu wala al-nasara hatta tattabi'a millatahum qul inna huda al-lahi huwa al-huda wala-ini ittaba'ta ahwaahum ba'da alladhi jaaka mina al-'il'mi ma laka mina al-lahi min waliyyin wala nasirin