唯識二十論述記 1.196

1.196

述曰：眾合地獄有二山，勢猶若羝羊相去稍遠，名之為「離」，罪人居中。其山相逼迫令苦楚，碎骨爛肉，名之為「合」。既合復離，罪人復活，如是離合，經無量時，令其罪人受諸楚苦，碎而復合。舊言羺羊，顯其黑色。今言羝羊，事如相鬪。餘則不然，非羝羊等，亦名羺羊故，依其梵本，但言羝羊。

The Commentary says: In the Saṃghāta hell there are two mountains whose contours resemble rams; when they are somewhat far apart, this is called 'parting,' and the sinners dwell between them. When the mountains press against each other to inflict anguish, crushing bones and pulverizing flesh, this is called 'clashing together.' Having clashed, they part again, and the sinners revive; parting and clashing in this manner over an immeasurable time, they cause the sinners to endure all kinds of anguish, crushed and then reunited. The old translation said 'black sheep,' to indicate their black color. The present version says 'rams,' their action being like fighting each other. The rest is not so; things other than rams are not also called 'black sheep,' so relying on the Sanskrit text, it simply says 'rams.'