Dharmaguptaka

The Dharmaguptaka biography of the Buddha is the most exhaustive of all classical biographies of the Buddha, and is entitled Abhiniṣkramaṇa Sūtra. Various Chinese translations of this text date from between the 3rd and 6th century CE.

... [T]he overall picture that the Ugra presents is quite clear. It describes a monastic community in which scriptures concerning the bodhisattva path were accepted as legitimate canonical texts (and their memorization a viable monastic specialty), but in which only a certain subset of monks were involved in the practices associated with the Bodhisattva Vehicle.