Surah At-Tawbah, Verse 56

وَيَحۡلِفُونَ بِٱللَّهِ إِنَّهُمۡ لَمِنكُمۡ وَمَا هُم مِّنكُمۡ وَلَٰكِنَّهُمۡ قَوۡمٞ يَفۡرَقُونَ٥٦

wayaḥlifūna bil-lahi innahum laminkum wamā hum minkum walākinnahum qawmun yafraqūna

And they swear by Allāh that they are from among you while they are not from among you; but they are a people who are afraid.