Surah Aali Imran (The Family of Imran), Verse 19

اِنَّ الدِّیْنَ عِنْدَ اللّٰهِ الْاِسْلَامُ وَمَا اخْتَلَفَ الَّذِیْنَ اُوْتُوا الْكِتٰبَ اِلَّا مِنْ بَعْدِ مَا جَآءَهُمُ الْعِلْمُ بَغْیًا بَیْنَهُمْ وَمَنْ یَّكْفُرْ بِاٰیٰتِ اللّٰهِ فَاِنَّ اللّٰهَ سَرِیْعُ الْحِسَابِ ۟

Innad deena 'indal laahil Islaam; wa makhtalafal lazeena ootul Kitaaba illaa mim ba'di maa jaaa'ahumul 'ilmu baghyam bainahum; wa mai yakfur bi Aayaatil laahi fa innal laaha saree'ul hisaab

“The Religion before Allah is Islam (submission to His Will): Nor did the People of the Book dissent therefrom except through envy of each other, after knowledge had come to them. But if any deny the Signs of Allah, Allah is swift in calling to account.”

Quran 3:19 (Yusuf Ali Translation)