四分律刪繁補闕行事鈔 2.329

2.329

不大揣者，非口不容受也。不犯者：病、時欲過、二難疾食者。

Not making excessively large morsels means not making them too big for the mouth to contain. One does not commit an offense if: ill, the time is about to expire, or eating hastily due to the two perils.