Miqdambin Madikarib said:
"I heard the Messenger of Allah (ﷺ) say:'Ahuman being fills no worse vessel than his stomach. It issufficientfor a human being to eat a few mouthfuls to keep his spinestraight.But if he must (fill it), then one third of food, one thirdfor drinkand one third for air.'" (IT)
English reference (IT): Vol. 4, Book 29, Hadith 3349 (IT)
Arabic reference (IT): Book 29, Hadith 3474 (IT)