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:6152a –
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السيوطي:٦١٥٢a –

"إِنَّ أَخوفَ ما أَخافُ على أُمَّتِى الكتابُ واللَّبَنُ فأَما اللَّبنُ فينتجعُ

أَقوامٌ بِجُبنِه ويتركُونَ الجماعةَ (والجُمُعات) وأَما الكتابُ فَيُفْتَحُ لأَقوامٍ فيه فَيُجَادِلون بِه الَّذِين آمَنوا".  

[طب] الطبرانى في الكبير عن عقبة، بن عامر ؓ

See similar narrations below:

Collected by Ṭabarānī
tabarani:14944 – Muṭṭalib b. Shuʿayb al-Azdī > ʿAbdullāh b. Ṣāliḥ > al-Layth > Abū Qabīl al-Maʿāfirī > ʿUqbah b. ʿĀmir

[Machine] On the authority of the Messenger of Allah ﷺ, he said, "Indeed, the thing I fear most for my Ummah is milk and a book. As for milk, it will be opened for some groups, who will abandon the Friday prayer and congregational prayers. And as for the book, it will be opened for some groups, who will argue with it against those who believe."  

الطبراني:١٤٩٤٤ – حَدَّثَنَا مُطَّلِبُ بْنُ شُعَيْبٍ الْأَزْدِيُّ ثَنَا عَبْدُ اللهِ بْنُ صَالِحٍ حَدَّثَنِي اللَّيْثُ عَنْ أَبِي قَبِيلٍ الْمَعَافِرِيِّ عَنْ عُقْبَةَ بْنِ عَامِرٍ

عَنْ رَسُولِ اللهِ ﷺ قَالَ «إِنَّ أَخْوَفَ مَا أَخَافُ عَلَى أُمَّتِي الْكِتَابُ وَاللَّبَنُ فَأَمَّا اللَّبَنُ فَيُفْتَحُ لِأَقْوَامٍ فِيهِ فَيَتْرُكُونَ الْجُمُعَةَ وَالْجُمُعَاتِ وَأَمَّا الْكِتَابُ فَيُفْتَحُ لِأَقْوَامٍ فِيهِ فَيُجَادِلُونَ بِهِ الَّذِينَ آمَنُوا»