Sunan Ibn Majah, Book 6, Hadith 1547 (In-Book) ⓘ
It was narrated that Thawban, the freed slave of the Messenger of Allah, said: “The Messenger of Allah saw some people riding on their animals in a funeral (procession). He said: ‘Do you not feel ashamed that the angels of Allah are walking on foot and you are riding?’”
حَدَّثَنَا كَثِيرُ بْنُ عُبَيْدٍ الْحِمْصِيُّ، حَدَّثَنَا بَقِيَّةُ بْنُ الْوَلِيدِ، عَنْ أَبِي بَكْرِ بْنِ أَبِي مَرْيَمَ، عَنْ رَاشِدِ بْنِ سَعْدٍ، عَنْ ثَوْبَانَ، مَوْلَى رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ قَالَ رَأَى رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ نَاسًا رُكْبَانًا عَلَى دَوَابِّهِمْ فِي جِنَازَةٍ فَقَالَ " أَلاَ تَسْتَحْيُونَ أَنَّ مَلاَئِكَةَ اللَّهِ يَمْشُونَ عَلَى أَقْدَامِهِمْ وَأَنْتُمْ رُكْبَانٌ " .
also referenced under: Hadith 1480 (Reference) & Volume 2, Book 6, Hadith 1480 (DarusSalam)