四分律刪繁補闕行事鈔 2.336

2.336

噏飯者，張口遙呼吸食也。不犯者：有病、口痛；食羹、乳酪、苦酒者。

Slurping food means opening the mouth and inhaling food from afar. One does not commit an offense if: having an illness, having a sore mouth, or consuming soup, curds, or vinegar.