عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو رَضِيَ اللَّهُ عَنْهُمَا قَالَ أُنْزِلَتْ عَلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ سُورَةُ الْمَائِدَةِ وَهُوَ رَاكِبٌ عَلَى رَاحِلَتِهِ فَلَمْ تَسْتَطِعْ أَنْ تَحْمِلَهُ فَنَزَلَ عَنْهَا
It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that when Surah Al-Ma'idah was revealed to the Noble Prophet (peace and blessings be upon him), he was mounted on his ride. The ride did not have enough strength to bear him in that state, so the Prophet (peace and blessings be upon him) dismounted from it.