We went to Abdullah b. 'Amr when Mu'dwiya came to Kufa, and he made a mention of Messenger of Allah ﷺ and said: He was never immoderate in his talk and he never reviled others. Messenger of Allah ﷺ also said: The best amongst you are those who are best in morals. Uthman said: When he came to Kufa along with Mu'awiya... (The rest of the hadith is the same).
دَخَلْنَا عَلَى عَبْدِ اللَّهِ بْنِ عَمْرٍو حِينَ قَدِمَ مُعَاوِيَةُ إِلَى الْكُوفَةِ فَذَكَرَ رَسُولَ اللَّهِ ﷺ فَقَالَ لَمْ يَكُنْ فَاحِشًا وَلاَ مُتَفَحِّشًا وَقَالَ قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ مِنْ خِيَارِكُمْ أَحَاسِنَكُمْ أَخْلاَقًا قَالَ عُثْمَانُ حِينَ قَدِمَ مَعَ مُعَاوِيَةَ إِلَى الْكُوفَةِ