首楞嚴義疏注經 8.18

8.18

有資益義，皆名為甘。不正消變，能壞身心，皆名為毒。五辛者，謂大蒜、茖葱、慈葱、蘭葱、興渠。是五性熱，氣葷味辣，修行者食，能殺法身，如食毒也，故須斷之。

Whatever has the meaning of nourishing and benefiting is called sweet. Whatever is not properly digested and transformed and can destroy body and mind is called poisonous. The five pungent roots are garlic, scallions, leeks, wild chives, and asafetida. The nature of these five is hot, their vapor foul, and their flavor pungent; when cultivators eat them, they can kill the Dharma-body, just like eating poison, so they must be severed.