Sahih Al Bukhari – Book of Food, Meals

Volumn 007, Book 065, Hadith Number 311. 
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Narated By Abu Juhaifa Razi Allah Anhu : While I was with the Prophet Peace Be Upon Him he said to a man who was with him, "I do not take my meals while leaning."

​may Allah guide me towards the right path as well.​

lean/lēn/

Verb:	Be in or move into a sloping position: "he leaned back in his chair".
Noun:	A deviation from the perpendicular; an inclination.
Adjective:	(of a person or animal) Thin, esp. healthily so; having no superfluous fat.
Synonyms:	verb.  incline – rest – tilt – recline noun.  inclination – tilt – gradient – incline – bias – tip