3349. Miqdam bin Madikarib said: “I heard the Messenger of Allah (peace be upon him) say: ‘A human being fills no worse vessel than his stomach, It is sufficient for a human being to eat a few mouthfuls to keep his spine straight. But if he must (fill it), then one third for food, one third for drink and one third for air.’” (Sahih)
Chapter 6. Eating While Reclining
3262. It was narrated from Abu Juhaifah that the Messenger of Allah (peace and blessings of Allah be upon him) said: “I do not eat while reclining.” (Sahih)
Sunan Ibn Majah – Volume 4 – English Translation by Nasiruddin al-Khattab – Published by Darussalam – First Edition 2007.