Sunan Ibn Majah, Book 29, Hadith 3495 (In-Book) ⓘ
It was narrated from Salim that his father said: “The Messenger of Allah forbade a man from eating while lying down on his face.”
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا كَثِيرُ بْنُ هِشَامٍ، حَدَّثَنَا جَعْفَرُ بْنُ بُرْقَانَ، عَنِ الزُّهْرِيِّ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، قَالَ نَهَى رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ أَنْ يَأْكُلَ الرَّجُلُ وَهُوَ مُنْبَطِحٌ عَلَى وَجْهِهِ .
also referenced under: Hadith 3370 (Reference) & Volume 4, Book 29, Hadith 3370 (DarusSalam)