瑜伽論記 4.250

4.250

第二辨相中，唯辨七解脫，後等至門方釋第八故。謂生欲界等者，釋有色義，此說初修未離色染。

In the second section on distinguishing the characteristics, it only distinguishes seven liberations, because only in the subsequent section on meditative attainments is the eighth explained. The statement "Born in the desire realm, etc." explains the meaning of "having form"; this refers to the initial cultivation when one has not yet abandoned defilement of form.