وَيَحۡلِفُونَ بِٱللَّهِ إِنَّهُمۡ لَمِنكُمۡ وَمَا هُم مِّنكُمۡ وَلَٰكِنَّهُمۡ قَوۡمٞ يَفۡرَقُونَ
Wayahlifoona biAllahi innahum laminkum wama hum minkum walakinnahum qawmun yafraqoona
They swear by Allah that they are indeed of you; but they are not of you: yet they are afraid (to appear in their true colours).