Noble Eightfold Path - Origin

Origin

According to discourses found in both the Theravada school's Pali canon, and some of the Āgamas in the Chinese Buddhist canon, the Noble Eightfold Path was rediscovered by Gautama Buddha during his quest for enlightenment. The scriptures describe an ancient path which has been followed and practiced by all the previous Buddhas. The Noble Eightfold Path is a practice said to lead its practitioner toward self-awakening and liberation. The path was taught by the Buddha to his disciples so that they, too, could follow it.

In the same way I saw an ancient path, an ancient road, traveled by the Rightly Self-awakened Ones of former times. And what is that ancient path, that ancient road, traveled by the Rightly Self-awakened Ones of former times? Just this noble eightfold path: right view, right aspiration, right speech, right action, right livelihood, right effort, right mindfulness, right concentration...I followed that path. Following it, I came to direct knowledge of aging & death, direct knowledge of the origination of aging & death, direct knowledge of the cessation of aging & death, direct knowledge of the path leading to the cessation of aging & death...Knowing that directly, I have revealed it to monks, nuns, male lay followers & female lay followers... —Nagara Sutta

The practice of the Noble Eightfold Path varies from one Buddhist school to another. Depending on the school, it may be practiced as a whole, only in part, or it may have been modified. Each Buddhist lineage implements the path in the manner most conducive to the development of the students drawn to that lineage.

Additionally, some sources give alternate definitions for the Noble Eightfold Path. The Ekottara Āgama in particular contains variant teachings of basic doctrines such as the Noble Eightfold Path, which are different from those found in the Pali Canon.