The Prophet ﷺ reported that we mentioned Dajjal in the presence of the Prophet ﷺ while he was sleeping. He awoke with his face flushed red and said, "Something other than that is what I fear more for you," and he mentioned a word.
أنبأنا أبو النضر حدثنا الأشجعي عن شيبان عن جابر عن عبد الله بن نجي
عن النبي ﷺ قال ذكرنا الدجال عند النبي ﷺ وهو نائم فاستيقظ محمرا لونه فقال غير ذلك أخوف لي عليكم ذكر كلمة
Its isnad is extremely daif. Jabir is Ibn Yazid Jufi, extremely daif, as mentioned previously in hadith 41. The hadith appears in Majma al-Zawaid 7:334, where it is graded daif.Regarding the phrase "he mentioned a word," this is how it appears in the Musnad and in Zawaid. It appears that one of the narrators forgot the word, and it may be what is reported in the hadith of Huzaifa about the tribulation which some Muslims report, and that is a sahih hadith in Zawaid 7:335, attributed to Ahmad and Bazzar.