瑜伽師地論略纂 3.60

3.60

「伊師迦」者，西方二釋：一、近王舍城，有高大山，堅硬常住，我等亦爾；或復有草，名伊師迦，體性堅實，故喻我等。

Regarding "*Iṣīkā*": there are two interpretations in the Western region. First, near Rājagṛha, there is a high, large mountain that is hard and eternal, and the self and so forth are also like this; or second, there is a grass named *iṣīkā* whose substance is firm and solid, hence it is used as an analogy for the self and so forth.