俱舍論記 14.180

14.180

「又契經說至是性罪攝」者，第二極少不飲證。極少不開，明知性罪。

[On the phrase,] "Furthermore, the sūtra states [...] is subsumed under natural offenses": This is the second proof: not drinking even the smallest amount. Since not even the slightest amount is permitted, it is clearly known to be a natural offense.