Abu Dawud Book 35, Hadith Number 4738.
Chapter : Not known.
Narated By AbuUbaydah ibn al-Jarrah : I heard the Prophet (PBUH) 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 Apostle of Allah (PBUH) described him to us, saying: Perhaps some who have seen me and heard my words will live till his time. The people asked: Apostle of Allah! what will be the condition of our hearts on that day? Like what we are today? He replied: Or better.