Narrated Ibn 'Umar:
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.'" (JA)
English reference (JA): Vol. 1, Book 46, Hadith 3866 (JA)
Arabic reference (JA): Book 49, Hadith 4240 (JA)