俱舍論記 10.164

10.164

「段有二種至翻此為麁」者，此下別釋段食。此顯段食或細或麁。一以無穢為細、有穢為麁。劫初食者，謂劫初時人食地味、地皮餅、林藤無變穢故，食香稻以去方有便穢。二少軟名細、多𮝓名麁。細汗虫，即是蟣虱。其體細小，從汗而生。或人身中有虫食汗，名細汗虫。

Regarding 'Material food is of two kinds [...] the contrary of this is coarse': Below this, material food is explained separately. This clarifies that material food is either subtle or coarse. First, that which is free of filth is subtle, and that which has filth is coarse. Food of the initial aeon refers to the people at the beginning of the aeon eating earth-taste, earth-cake, and forest-creepers without transforming into filth; only after eating fragrant rice did excrement and urine appear. Second, that which is little and soft is called subtle, and that which is much and coarse is called coarse. 'Minute sweat insects' refers to nits and lice. Their bodies are minute and small, and they are born from sweat. Alternatively, they are insects within human bodies that feed on sweat, called minute sweat insects.