Surah Ali'Imran, Verse 19

إِنَّ ٱلدِّينَ عِندَ ٱللَّهِ ٱلۡإِسۡلَٰمُۗ وَمَا ٱخۡتَلَفَ ٱلَّذِينَ أُوتُواْ ٱلۡكِتَٰبَ إِلَّا مِنۢ بَعۡدِ مَا جَآءَهُمُ ٱلۡعِلۡمُ بَغۡيَۢا بَيۡنَهُمۡۗ وَمَن يَكۡفُرۡ بِـَٔايَٰتِ ٱللَّهِ فَإِنَّ ٱللَّهَ سَرِيعُ ٱلۡحِسَابِ١٩

inna l-dīna ʿinda l-lahi l-is'lāmu wamā ikh'talafa alladhīna ūtū l-kitāba illā min baʿdi mā jāahumu l-ʿil'mu baghyan baynahum waman yakfur biāyāti l-lahi fa-inna l-laha sarīʿu l-ḥisābi

Indeed, the religion in the sight of Allāh is Islām. And those who were given the Scripture did not differ except after knowledge had come to them - out of jealous animosity between themselves. And whoever disbelieves in the verses of Allāh, then indeed, Allāh is swift in [taking] account.