Qur'an 9:56

وَيَحْلِفُونَ بِٱللَّهِ إِنَّهُمْ لَمِنكُمْ وَمَا هُم مِّنكُمْ وَلَـٰكِنَّهُمْ قَوْمٌ يَفْرَقُونَ

“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.”

At-Tawba 9:56 · Saheeh International