The introductory stanzas (976-1031) of the Parāyanavagga which give the story of Bāvarī, the circumstances which led to his sending his students to the Buddha and their journey to Rājagaha (SN., pp. 190-7).
The Cullaniddesa, which comments on the Parāyanavagga (p.6ff), does not comment on these stanzas.