The four stages of awakening in Early Buddhism and Theravada
are four progressive stages culminating in full awakening (Bodhi) as an Arahant.
These four stages are Sotāpanna (stream-enterer), Sakadāgāmi (once-returner), Anāgāmi (non-returner), and Arahant. The oldest Buddhist texts portray the Buddha as referring to people who are at one of these four stages as noble people (ariya-puggala) and the community of such persons as the noble sangha (ariya-sangha).
The teaching of the four stages of awakening is a central element of the early Buddhist schools, including the Theravada school of Buddhism, which still survives.

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