The à ÂuddhÃÂvÃÂsa (PÃÂli: ; Tib: ) worlds, or "Pure Abodes", are distinct from the other worlds of the ' in that they do not house beings who have been born there through ordinary merit or meditative attainments, but only those AnÃÂgÃÂmins ("Non-returners") who are already on the path to Arhat-hood and who will attain enlightenment directly from the à ÂuddhÃÂvÃÂsa worlds without being reborn in a lower plane. Every à ÂuddhÃÂvÃÂsa deva is therefore a protector of Buddhism. (Brahma Sahampati, who appealed to the newly enlightened Buddha to teach, was an Anagami from a previous Buddha). Because a à ÂuddhÃÂvÃÂsa deva will never be reborn outside the à ÂuddhÃÂvÃÂsa worlds, no Bodhisattva is ever born in these worlds, as a Bodhisattva must ultimately be reborn as a human being.
Since these devas rise from lower planes only due to the teaching of a Buddha, they can remain empty for very long periods if no Buddha arises. However, unlike the lower worlds, the à ÂuddhÃÂvÃÂsa worlds are never destroyed by natural catastrophe. The à ÂuddhÃÂvÃÂsa devas predict the coming of a Buddha and, taking the guise of Brahmins, reveal to human beings the signs by which a Buddha can be recognized. They also ensure that a Bodhisattva in his last life will see the four signs that will lead to his renunciation.
The Princeton Dictionary of Buddhism states that "The heavens of the realm of subtle materiality (') consist of sixteen (according to the SarvÃÂstivÃÂda school), seventeen (the Sautrantika school), or eighteen levels (the Theravada/SthavirankÃÂya school) of devas ... The last five heavens are collectively designated as the five pure abodes, and the divinities residing there are called the à ÂuddhÃÂvÃÂsakÃÂyika devas."
The five ' worlds are: