俱舍論疏 14.226

14.226

論「又令醉亂至所霑量」，通第二證。不能飲者，乃至茅端所霑量酒亦醉亂故。若開能者，此類亂故，所以總遮。

The treatise says: "Furthermore, it causes intoxication and confusion [...] the amount that moistens the tip of a blade of grass." This resolves the second proof. For those who cannot drink, even the amount of alcohol that moistens the tip of a blade of grass causes intoxication and confusion. If it were permitted for those who can drink, those of this sort would be confused, which is why it was prohibited entirely.