Quran Ali 'Imran 3:100
يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓاْ إِن تُطِيعُواْ فَرِيقٗا مِّنَ ٱلَّذِينَ أُوتُواْ ٱلۡكِتَٰبَ يَرُدُّوكُم بَعۡدَ إِيمَٰنِكُمۡ كَٰفِرِينَ ١٠٠
Translation
O you who have believed, if you obey a party of those who were given the Scripture, they would turn you back, after your belief, [to being] unbelievers.