شَهِدَ اللَّـهُ أَنَّهُ لَا إِلَـٰهَ إِلَّا هُوَ وَالْمَلَائِكَةُ وَأُولُو الْعِلْمِ قَائِمًا بِالْقِسْطِ ۚ لَا إِلَـٰهَ إِلَّا هُوَ الْعَزِيزُ الْحَكِيمُ ﴿١٨﴾ إِنَّ الدِّينَ عِندَ اللَّـهِ الْإِسْلَامُ ۗ وَمَا اخْتَلَفَ الَّذِينَ أُوتُوا الْكِتَابَ إِلَّا مِن بَعْدِ مَا جَاءَهُمُ الْعِلْمُ بَغْيًا بَيْنَهُمْ ۗ وَمَن يَكْفُرْ بِآيَاتِ اللَّـهِ فَإِنَّ اللَّـهَ سَرِيعُ الْحِسَابِ ﴿١٩﴾

Shahidallaahu annahoo laaa ilaaha illaa Huwa wal-malaaa'ikatu wa ulul-'ilmi qaaa'imam-bilqist; laaa ilaaha illaa Huwal-'Azeezul-Hakeem. Innad-deena 'indallaahil-Islaam; wa makhtalafal-lazeena ootul-Kitaaba illaa mim-ba'di maa jaaa'ahumul-'ilmu baghyam-bainahum; wa man yakfur bi-aayaatillaahi fa-innallaaha saree'ul-hisaab.

(18) Allah witnesses that there is no deity except Him, and [so do] the angels and those of knowledge - [that He is] maintaining [creation] in justice. There is no deity except Him, the Exalted in Might, the Wise. (19) Indeed, the religion in the sight of Allah is Islam. 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 Allah, then indeed, Allah is swift in [taking] account.

Reference: Surah Ali-Imran 3: 18-19