Sahih al-Bukhari 5398
Book 70: Food, Meals · Narrated by Abu Juhaifa
Arabic
حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا مِسْعَرٌ، عَنْ عَلِيِّ بْنِ الأَقْمَرِ، سَمِعْتُ أَبَا جُحَيْفَةَ، يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لاَ آكُلُ مُتَّكِئًا ".
English translation
Narrated Abu Juhaifa:Allah's Messenger (ﷺ) said, "I do not take my meals while leaning (against something)
Reference: Sahih al-Bukhari 5398, Book of Food, Meals. English translation by Dr. Muhammad Muhsin Khan.