Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:9:56 –

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.  

And they swear by God that they truly are of you, that is, ˹that they are˺ believers; but they are not of you; they are a folk who are afraid, that you should deal with them as you have done with the idolaters, and so they swear merely in pretence, in order to protect themselves.
القرآن:٩:٥٦ –

وَيَحْلِفُونَ بِاللَّهِ إِنَّهُمْ لَمِنْكُمْ وَمَا هُمْ مِنْكُمْ وَلَٰكِنَّهُمْ قَوْمٌ يَفْرَقُونَ  

{ويحلفون بالله إنهم لمنكم} أي مؤمنون {وما هم منكم ولكنهم قوم يفرقون} يخافون أن تفعلوا بهم كالمشركين فيحلفون تقية.