成唯識論演祕 7.232

7.232

以五道中初之二道標二位名，俱有漏道。有漏道中散、定體別，分為二也。「分」者，別也。

Because among the five paths, the first two paths are designated with the names of two stages, both are sāsrava paths. Within the sāsrava path, the entities of dispersion and concentration are distinct, so they are divided into two. 'Distinguishing' means differentiating.