From Sahih Muslim (Hadith 6453):
Abu Huraira reported:There are some distinguishing features of Banu Tamim which I heard from Allah's Messenger (ﷺ) and my love for them is never on the decline after that and the words are: They are the bravest amongst people in the battlefield and there is no mention of (the word)" Dajjal
Reference: Muslim 6453