四分律比丘含注戒本 3.211

3.211

佛在舍衛。居士設供，六群大揣，令口不受。居士譏言：「不知厭足，如猪、狗、駱駝、驢、牛、烏鳥。」比丘開舉，佛因制戒。

The Buddha was in Śrāvastī. A householder prepared an offering of food. The group of six made large mouthfuls so that their mouths could not receive them. The householder criticized them, saying: "Not knowing moderation, like pigs, dogs, camels, donkeys, oxen, and crows." The bhikṣus reported and brought up the matter, and the Buddha consequently formulated the precept.