وَيَحلِفونَ بِاللَّهِ إِنَّهُم لَمِنكُم وَما هُم مِنكُم وَلـٰكِنَّهُم قَومٌ يَفرَقونَ

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