俱舍論記 25.85

25.85

「與道類同至無餘依故」者，答。解脫、勝進與加行、無間，道類同故名道。又解：解脫、勝進漸漸轉向後上品故，與後為道故名道。又解：解脫道與加行、無間道同類故名道。若勝進道轉上品故名道，或由前前解脫、勝進力，隨其所應能至後後諸道位中，故名為道。或此二種俱能趣入無餘依故亦名為道。

Regarding "Because they are of the same class as the path [...] because it has no remainder": this is the answer. Liberation and excellence are of the same class as the preparatory and uninterrupted [paths], and are therefore called paths. Another interpretation: liberation and excellence gradually turn toward higher and superior [stages] later on, serving as paths toward what follows, and are therefore called paths. Another interpretation: the path of liberation is of the same class as the preparatory and uninterrupted paths, and is therefore called a path. As for the path of excellence, because it advances to higher stages, it is called a path; or, through the power of each preceding liberation and excellence, one is able, as appropriate, to reach each subsequent stage of the path, and therefore they are called paths. Alternatively, because both of these are able to lead into [nirvāṇa] without remainder, they are also called paths.