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:21102a –
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السيوطي:٢١١٠٢a –

"مَنْ تَشَبَّهَ بِقَوْمٍ فَهُوَ مِنْهُمْ".  

[د] أبو داود عن ابن عمر، [ن] النسائي عن أَبي عبيدة بن حذيفة عن أَبيه

See similar narrations below:

Collected by Abū Dāwūd
abudawud:4031 – ʿUthmān b. Abū Shaybah > Abū al-Naḍr > ʿAbd al-Raḥman b. Thābit > Ḥassān b. ʿAṭiyyah > Abū Munīb al-Jurashī > Ibn ʿUmar

The Prophet ﷺ said: He who copies any people is one of them.  

أبو داود:٤٠٣١ – حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ حَدَّثَنَا أَبُو النَّضْرِ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ ثَابِتٍ حَدَّثَنَا حَسَّانُ بْنُ عَطِيَّةَ عَنْ أَبِي مُنِيبٍ الْجُرَشِيِّ عَنِ ابْنِ عُمَرَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ تَشَبَّهَ بِقَوْمٍ فَهُوَ مِنْهُمْ