The Messenger of Allah ﷺ was present with a she-mule which he rode, so Ali said: If we made asses cover mares we would have animals of this type. The Messenger of Allah ﷺ said: Only those who do not know do that. (Using translation from Abū Dāʾūd 2565)
أُهْدِيَتْ لِرَسُولِ اللهِ ﷺ بَغْلَةٌ فَرَكِبَهَا فَقَالَ عَلِيٌّ لَوْ حَمَلْنَا الْحَمِيرَ عَلَى الْخَيْلِ لَكَانَتْ لَنَا مِثْلَ هَذِهِ قَالَ رَسُولُ اللهِ ﷺ «إِنَّمَا يَفْعَلُ ذَلِكَ الَّذِينَ لَا يَعْلَمُونَ»