諸經之首,有通序別序,如是我聞等之六成就,通諸經有之,曰通序,本經特殊之緣起曰別序。參照序條。
The two kinds of introductory phrase: (a) the ordinary opening phrase of a sutra— "Thus have I heard"; and (b) specific openings referring to the circumstances in which the sūtra was produced.
諸經開頭時,有通序和別序。如是我聞等是共通於諸經都有,叫通序,序說本經特殊的緣起,叫別序。