四分律刪繁補闕行事鈔 3.234

3.234

四不作餘食法。由食多無度，妨道業故。《智論》：由求小食中食後食，則失半日之功；佛法為行道故，不為益身，如養馬養猪等。

Fourth, the method of not eating remaining food: This is because eating abundantly without restraint hinders the practice of the path. The Mahāprajñāpāramitopadeśa states: "Because of seeking light meals, noon meals, and afternoon meals, half a day's work is lost; the Buddha's Dharma is for practicing the path, not for fattening the body like raising horses or pigs."