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»  

I was with Ibn 'Abbas and a man asked him: "Did the Messenger of Allah recite during Zuhr and 'Asr?" He said: "No." He said: "Perhaps he used to recite to himself?" He said: "May your face be scratched! This question is worse than the first one. The Messenger of Allah was a slave whose Lord commanded him and he conveyed (the message). By Allah, the Messenger of Allah did not specify anything for us above the people, except for three things: He commanded us to perform Wudu' properly, not to consume charity, and not to mate donkeys with horses." (Using translation from Nasāʾī 3581)  

كُنْتُ عِنْدَ عَبْدِ اللهِ بْنِ عَبَّاسٍ فَسَأَلَهُ رَجُلٌ أَكَانَ رَسُولُ اللهِ ﷺ يَقْرَأُ فِي الظُّهْرِ وَالْعَصْرِ؟ قَالَ لَا قَالَ فَلَعَلَّهُ كَانَ يَقْرَأُ فِي نَفْسِهِ؟ قَالَ خَمْشًا هَذِهِ شَرٌّ مِنَ الْأُولَى إِنَّ رَسُولَ اللهِ ﷺ عَبْدٌ أَمَرَهُ اللهُ بِأَمْرِهِ فَبَلَّغَهُ وَاللهِ مَا اخْتَصَّنَا رَسُولُ اللهِ ﷺ بِشَيْءٍ دُونَ النَّاسِ إِلَّا بِثَلَاثَةٍ «أُمِرْنَا أَنْ نُسْبِغَ الْوُضُوءَ وَأَنْ لَا نَأْكُلَ الصَّدَقَةَ وَأَنْ لَا نُنْزِي الْحُمُرَ عَلَى الْخَيْلِ»