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
suyuti:26351a –
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السيوطي:٢٦٣٥١a –

"لا يُعْجِبَنَّكُمْ إِسْلامُ رَجُلٍ حَتَّى تَعْلَمُوا مَا عَقَدَهُ عَقْلُهُ".  

الحكيم عن ابن عمر

See similar narrations below:

Collected by Suyūṭī
suyuti:26341a –
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السيوطي:٢٦٣٤١a –

"لا يعْجِبَنَّكُمْ إسْلامُ امْرِيءٍ حَتَّى تَعْلَمُوا مَا عَقَدَ عَقْلُهُ".  

[عق] العقيلى في الضعفاء وقال منكر، [عد] ابن عدى في الكامل [هب] البيهقى في شعب الإيمان وضعفه عن ابن عمر