"I heard the Messenger of Allah ﷺ: '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 ﷺ 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)  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ إِنَّهُ لَمْ يَكُنْ نَبِيٌّ بَعْدَ نُوحٍ إِلاَّ قَدْ أَنْذَرَ الدَّجَّالَ قَوْمَهُ وَإِنِّي أُنْذِرُكُمُوهُ فَوَصَفَهُ لَنَا رَسُولُ اللَّهِ ﷺ فَقَالَ لَعَلَّهُ سَيُدْرِكُهُ بَعْضُ مَنْ رَآنِي أَوْ سَمِعَ كَلاَمِي قَالُوا يَا رَسُولَ اللَّهِ فَكَيْفَ قُلُوبُنَا يَوْمَئِذٍ قَالَ مِثْلُهَا يَعْنِي الْيَوْمَ أَوْ خَيْرٌ