At Tawbah Ayah 101

وَمِمَّنْ حَوْلَكُم مِّنَ ٱلْأَعْرَابِ مُنَـٰفِقُونَ‌ۖ وَمِنْ أَهْلِ ٱلْمَدِينَةِ‌ۖ مَرَدُواْ عَلَى ٱلنِّفَاقِ لَا تَعْلَمُهُمْ‌ۖ نَحْنُ نَعْلَمُهُمْ‌ۚ سَنُعَذِّبُهُم مَّرَّتَيْنِ ثُمَّ يُرَدُّونَ إِلَىٰ عَذَابٍ عَظِيمٍ ١٠١ Some of the nomads around you ?believers? are hypocrites, as are some of the people of Medina. They have mastered hypocrisy. They are not known to you ?O Prophet?; they are known to Us. We will punish them twice ?in this world?, then they will be brought back ?to their Lord? for a tremendous punishment.