瑜伽論記 23.201

23.201

第九解聖道，由五種相，當知八聖道最勝無罪，下文有六句，何故名五耶？三藏云：後二合一，故有五相。何故須合，并簡外故果有五相？如攝異門者，謂是為婆羅門無猶預等等有五句，如第八十四卷。

The ninth [gate] explains the noble path. Through five modes, one should know the eightfold noble path is supreme and faultless. The subsequent text has six phrases; why is it called five? The Tripiṭaka Master says: The last two are combined into one, hence there are five modes. Why must they be combined, also to exclude outsiders so that the fruition has five modes? As in the Paryāyasaṃgrahaṇī: that is, "being a brāhmaṇa, without doubt, etc.," has five phrases, as in fascicle 84.