[Machine] The Prophet ﷺ used to be on his camel when revelation came down to him, and the camel would lower its back so it couldn't move. This is mentioned in the following verse of the Quran: "Indeed, We will throw upon you a heavy word." [Surah Al-Muzzammil, verse 5]
أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا أُوحِيَ إِلَيْهِ وَهُوَ عَلَى نَاقَتِهِ وَضَعَتْ جِرَانَهَا فَلَمْ تَسْتَطِعْ أَنْ تَتَحَرَّكْ وَتَلَتْ قَوْلَ اللَّهِ ﷻ {إِنَّا سَنُلْقِي عَلَيْكَ قَوْلًا ثَقِيلًا} [المزمل 5]