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
tabarani:11680 – ʿAlī b. ʿAbd al-ʿAzīz > Abū Nuʿaym > al-Qāsim b. Ḥabīb al-Tammār > Nizār b. Ḥayyān > ʿIkrimah > Ibn ʿAbbās

[Machine] The Messenger of Allah ﷺ said: "Beware of extremism, as it is a branch of Christianity."  

الطبراني:١١٦٨٠ – حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ الْعَزِيزِ ثنا أَبُو نُعَيْمٍ ثنا الْقَاسِمُ بْنُ حَبِيبٍ التَّمَّارُ عَنْ نِزَارِ بْنِ حَيَّانَ عَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «اتَّقُوا الْقَدرَ فَإِنَّهُ شُعْبَةٌ مِنَ النَّصْرَانِيَّةِ»  

See similar narrations below:

Collected by Suyūṭī
suyuti:441a –
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السيوطي:٤٤١a –

"اتقوا القدرَ فإِنَّه شعبةٌ من النصرانيَّة".  

ابن أبي عاصم في السنة، [طب] الطبرانى في الكبير [عد] ابن عدى في الكامل عن ابن عباس (فيه نزار بن خبان ضعيف)