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Atappā-devā

They belong to the Suddhāvāsā (D.ii.52; D.iii.237).

According to Buddhaghosa (DA.ii.480; VibhA.521) they are so called because they torment no one (na kañci sattaṃ tapenti).

They are Non-returners (anāgāmi). ItA.40.

Dictionary of Pāli Proper Names • G.P. Malalasekera