Narrated Abu Al-Ash'ath As-Sana'ani:

"Some people were delivering Khutbah in Ash-Sham, and among them were Companions of the Prophet ﷺ. So the last of them, a man called Murrah bin Ka'b, stood, and he said: 'If it were not for a Hadith I heard from the Messenger of Allah ﷺ, I would not have stood (to address you). He ﷺ mentioned the tribulations, and that they would be coming soon. Then a man who was concealed by a garment passed by. So he said: "This one will be upon guidance that day." So I went towards him, and it was 'Uthman bin 'Affan. I turned, facing him, and I said: "This one?" He said: "Yes."

حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا عَبْدُ الْوَهَّابِ الثَّقَفِيُّ، حَدَّثَنَا أَيُّوبُ، عَنْ أَبِي قِلاَبَةَ، عَنْ أَبِي الأَشْعَثِ الصَّنْعَانِيِّ، أَنَّ خُطَبَاءَ، قَامَتْ بِالشَّامِ وَفِيهِمْ رِجَالٌ مِنْ أَصْحَابِ رَسُولِ اللَّهِ ﷺ فَقَامَ آخِرُهُمْ رَجُلٌ يُقَالُ لَهُ مُرَّةُ بْنُ كَعْبٍ فَقَالَ لَوْلاَ حَدِيثٌ سَمِعْتُهُ مِنْ رَسُولِ اللَّهِ ﷺ مَا قُمْتُ . وَذَكَرَ الْفِتَنَ فَقَرَّبَهَا فَمَرَّ رَجُلٌ مُقَنَّعٌ فِي ثَوْبٍ فَقَالَ هَذَا يَوْمَئِذٍ عَلَى الْهُدَى فَقُمْتُ إِلَيْهِ فَإِذَا هُوَ عُثْمَانُ بْنُ عَفَّانَ . قَالَ فَأَقْبَلْتُ عَلَيْهِ بِوَجْهِهِ فَقُلْتُ هَذَا قَالَ نَعَمْ . قَالَ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ . وَفِي الْبَابِ عَنِ ابْنِ عُمَرَ وَعَبْدِ اللَّهِ بْنِ حَوَالَةَ وَكَعْبِ بْنِ عُجْرَةَ .