التَّوْبَةِ · 56

وَيَحۡلِفُونَ بِٱللَّهِ إِنَّهُمۡ لَمِنكُمۡ وَمَا هُم مِّنكُمۡ وَلَٰكِنَّهُمۡ قَوۡمࣱ يَفۡرَقُونَ

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)