Miqdam bin Maadi reported,

I heard the Messenger of Allah ﷺ say, "The son of Adam fills no vessel worse than his stomach. A few morsels are enough for the son of Adam to keep his back straight. But if he must eat more, then a third for his food, a third for his drink, and a third for his breath."

Azami 15102

Sahih

عن المقدام بن معدي كرب الكندي قال

سمعت رسول الله ﷺ يقول: ما ملأ ابن آدم وعاء شرا من بطن، حسب ابن آدم أكلات يقمن صلبه، فإن كان لا محالة، فثلث طعام، وثلث شراب، وثلث لنفسه.

الأعظمي 15102صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Asceticism and softening of the heart
Chapter
Virtue of asceticism and softening of hearts
Section
Insignificance of the world
Numbering
Jami al-Kamil 15102 (2nd edition)
Azami 15102