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:1856a –
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السيوطي:١٨٥٦a –

"إِذَا رأيتُمَ الذين يلعنون أصحابى فالعنوهم".  

[ت] الترمذي عن ابن عمر

See similar narrations below:

Collected by Suyūṭī
suyuti:1857a –

that the Messenger of Allah ﷺ said: "If you see those who abuse my Companions, then say: 'May Allah's curse be upon the worst of you.'" (Using translation from Tirmidhī 3866)   

السيوطي:١٨٥٧a –

"إِذَا رأيتُمَ الذين يَسُبُّونَ أصحابي فقولُوا: لَعَنَ اللهُ شَرَّكُمْ" .  

الخطيب في أمالي العلماء، [هب] البيهقى في شعب الإيمان عن ابن عمر