Surah At-Taubah (The Repentance), Verse 101

وَمِمَّنْ حَوْلَكُمْ مِّنَ الْاَعْرَابِ مُنٰفِقُوْنَ وَمِنْ اَهْلِ الْمَدِیْنَةِ مَرَدُوْا عَلَی النِّفَاقِ لَا تَعْلَمُهُمْ نَحْنُ نَعْلَمُهُمْ سَنُعَذِّبُهُمْ مَّرَّتَیْنِ ثُمَّ یُرَدُّوْنَ اِلٰی عَذَابٍ عَظِیْمٍ ۟

Wa mimmann hawlakum minal A'raabi munaafiqoona wa min ahlil Madeenati maradoo 'alan nifaaq, laa ta'lamuhum nahnu na'lamuhum; sanu'azzibuhum marrataini summa yuraddoona ilaa 'azaabin 'azeem

“Certain of the desert Arabs round about you are hypocrites, as well as (desert Arabs) among the Medina folk: they are obstinate in hypocrisy: thou knowest them not: We know them: twice shall We punish them: and in addition shall they be sent to a grievous penalty.”

Quran 9:101 (Yusuf Ali Translation)