俱舍論疏 18.101

18.101

論「言施類福者至准此應釋」，解類是體也。如葉類器以葉為體，草類舍以草為體。

The treatise says: "From 'As for merit of the category of giving...' up to '...should be explained in accordance with this'" explains that "category" means the essence. Just as a vessel of the leaf category has leaves as its essence, and a hut of the grass category has grass as its essence.