成唯識論述記 5.551

5.551

述曰：此大小乘通許之經，非是解解脫義名《解脫經》，然四《阿含》不攝零落之經，諸部皆有，如《天請問經》等，並是為《阿含》不攝。此經解脫《阿含》故名為《解脫經》，若言零落經，名字惡也。其此頌文，長行自解。

The Commentary states: This is a sūtra mutually accepted by both Mahāyāna and Hīnayāna. It is not named the Vimuktisūtra because it explains the meaning of liberation (vimukti); rather, miscellaneous sūtras not subsumed within the four Āgamas are possessed by all schools, such as the Devatā-sūtra and others, all of which are not subsumed within the Āgamas. Because this sūtra is liberated from (detached from) the Āgamas, it is called the Vimuktisūtra; to call it a "scattered sūtra" would be an unpleasant name. The prose text itself explains this verse.