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:7398a –
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السيوطي:٧٣٩٨a –

"إِنَّ هذا العلمَ دِينٌ، فانظُروا عمَّن تأخذونه".  

أَبو نصر السجزى في الإبانة وقال غريبٌ، والديلمى عن أَبى هريرة (ورواه مسلم عن ابن سيرين من قوله)

See similar narrations below:

Collected by Muslim, Dārimī, Suyūṭī

Be careful where you get your religion from

muslim:i018 – Ḥasan b. al-Rabīʿ > Ḥammād b. Zayd > Ayyūb And Hishām > Muḥammad > Fuḍayl > Hishām > Makhlad b. Ḥusayn > Hishām > Muḥammad b. Sīrīn

‘Indeed this knowledge is faith, so carefully consider from whom you take your faith’.  

مسلم:i٠١٨ – حَدَّثَنَا حَسَنُ بْنُ الرَّبِيعِ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ عَنْ أَيُّوبَ وَهِشَامٍ عَنْ مُحَمَّدٍ وَحَدَّثَنَا فُضَيْلٌ عَنْ هِشَامٍ قَالَ وَحَدَّثَنَا مَخْلَدُ بْنُ حُسَيْنٍ عَنْ هِشَامٍ عَنْ مُحَمَّدِ بْنِ سِيرِينَ قَالَ

إِنَّ هَذَا الْعِلْمَ دِينٌ فَانْظُرُوا عَمَّنْ تَأْخُذُونَ دِينَكُمْ  

darimi:433 – ʿAffān > Ḥammād b. Zayd > Ibn ʿAwn > Muḥammad

[Machine] This knowledge is a religion, so let the person consider from whom they take their religion.  

الدارمي:٤٣٣ – أَخْبَرَنَا عَفَّانُ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ عَنِ ابْنِ عَوْنٍ عَنْ مُحَمَّدٍ قَالَ

«إِنَّ هَذَا الْعِلْمَ دِينٌ فَلْيَنْظُرِ الرَّجُلُ عَمَّنْ يَأْخُذُ دِينَهُ»