Narrated Abu Ubaydah ibn al-Jarrah: I heard the Prophet ﷺ say: There has been no Prophet after Noah who has not warned his people about the antichrist (Dajjal), and I warn you of him. The Messenger of Allah ﷺ described him to us, saying: Perhaps some who have seen me and heard my words will live till his time. The people asked: Messenger of Allah! what will be the condition of our hearts on that day? Like what we are today? He replied: Or better.
´Abu 'Ubaidah bin Al-Jarrah said:` "I heard the Messenger of Allah(s.a.w): 'There was never a Prophet after Nuh but that he warned his people about the Dajjal, and indeed I shall warn you of him.' Then the Messenger of Allah(s.a.w) described him for us, and he said: "Perhaps some of you who see me, or hear my words shall live to see him." They said: "O Messenger of Allah! How will our hearts be on that day?" He said: "The same – that is, as today – or better.” (Hasan)
Shaykh Dr. Abdur Rahman Freywai
Urdu Footnote: Note: (In the chain of narration, "Abdullah bin Saraqah" did not hear from "Abu Ubaidah radi Allahu anhu," that is, there is a discontinuity (inqita') in the chain.)
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 2234