大方便佛報恩經 6.113

6.113

[The Buddha] replied: "Any past life conditions cannot be relied upon [as standard]. What is spoken therein is neither sūtra nor vinaya, and cannot determine the true principle. It is also said: 'This was perhaps Kātyāyana, who in order to deliver Koṭīkarṇa manifested these transformations to awaken his mind; it was not an actual fact.' If having received the observance one wishes to renounce it, it is not necessary to renounce it before [a member of] the five assemblies. When one wishes to eat, merely speaking to a single person, the observance is immediately renounced."