Ahmed bin Abi 'Ubaid أحمد بن أبي عبيد الله · Chapters On Zuhd

"I heard the Messenger of Allah (S.a.w) saying: 'The human does not fill any container that is worse than his stomach. It is sufficient for the son of Adam to eat what will support his back. If this is not possible, then a third for food, a third for drink, and third for his breath."