成唯識論了義燈 5.203

5.203

二、出體者，《瑜伽論》七並以尋、伺為體。故《瑜伽》第五云：尋、伺差別者，有七種差別，即七分別。

Second, regarding defining their substance: In the Yogācārabhūmi, all seven take gross investigation and subtle investigation as their substance. Thus fascicle five of the Yogācāra says: "As for the distinctions of gross investigation and subtle investigation, there are seven kinds of distinctions, which are the seven conceptualizations."