Surah An-Nur (The Light), Verse 47

وَیَقُوْلُوْنَ اٰمَنَّا بِاللّٰهِ وَبِالرَّسُوْلِ وَاَطَعْنَا ثُمَّ یَتَوَلّٰی فَرِیْقٌ مِّنْهُمْ مِّنْ بَعْدِ ذٰلِكَ وَمَاۤ اُولٰٓىِٕكَ بِالْمُؤْمِنِیْنَ ۟

Wa yaqooloona aamannaa billaahi wa bir Rasooli wa ata'naa summa yatawallaa fareequm minhum mim ba'di zaalik; wa maaa ulaaa'ika bilmu'mineen

“They say, "We believe in Allah and in the messenger, and we obey": but even after that, some of them turn away: they are not (really) Believers.”

Quran 24:47 (Yusuf Ali Translation)