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Surah 2. Al-Baqara
Ayah 137 - 138
١٣٧. فَإِنْ ءَامَنُوا۟ بِمِثْلِ مَآ ءَامَنتُم بِهِۦ فَقَدِ ٱهْتَدَوا۟ ۖ وَّإِن تَوَلَّوْا۟ فَإِنَّمَا هُمْ فِى شِقَاقٍ ۖ فَسَيَكْفِيكَهُمُ ٱللَّهُ ۚ وَهُوَ ٱلسَّمِيعُ ٱلْعَلِيمُ
١٣٨. صِبْغَةَ ٱللَّهِ ۖ وَمَنْ أَحْسَنُ مِنَ ٱللَّهِ صِبْغَةً ۖ وَنَحْنُ لَهُۥ عَـٰبِدُونَ
137. So if they believe in the like of that which you believe then they are rightly guided; but if they turn away, then they are only in opposition. So Allah will suffice for you against them. And He is the Hearer, the Knower. 138. Our Sibghah (religion) is ﴾the Sibghah of Allah (Islam) and which Sibghah can be better than Allah's And we are His worshippers.
Allah said, if they, the disbelievers among the People of the Book and other disbelievers, believe in all of Allah's Books and Messengers and do not differentiate between any of them,
(then they are rightly guided) meaning, they would acquire the truth and be directed to it.
(but if they turn away) from truth to falsehood after proof had been presented to them,
(then they are only in opposition. So Allah will suffice you against them) meaning, Allah will aid the believers against them,
(And He is the Hearer, the Knower). Allah said,
(The Sibghah of Allah). Ad-Dahhak said that Ibn `Abbas commented, "The religion of Allah.'' This Tafsir was also reported of Mujahid, Abu Al-`Aliyah, `Ikrimah, Ibrahim, Al-Hasan, Qatadah, Ad-Dahhak, `Abdullah bin Kathir, `Atiyah Al-`Awfi, Ar-Rabi` bin Anas, As-Suddi and other scholars. The Ayah,
(Allah's Fitrah (i.e. Allah's Islamic Monotheism)) (30:30) directs Muslims to, "Hold to it.''