俱舍論疏 8.8

8.8

論「地獄洲異故成二十」，答也。地獄及人、鬼、畜等四，別舉總名不列別數。

The treatise says: "Due to differences in hells and continents, they amount to twenty." This is an answer. Hells, humans, ghosts, animals, and so forth—the four are cited by general names without listing individual counts.