四分律刪繁補闕行事鈔 2.319

2.319

用意受食者，非棄羹飯也。不犯者：有如是病、或鉢小故棄、或還墮案上者。

Receiving food mindfully means not discarding soup or rice. One does not commit an offense if: having such an illness, discarding it because the bowl is small, or if it falls back onto the table.