[981] Which phenomena (dhammā) are of the form sphere (rūpāvacara)?
The fourfold and fivefold jhānas of the form sphere — as wholesome (kusala), as resultant (vipāka), and as functional (kiriya) — these phenomena are of the form sphere.
Which phenomena are not of the form sphere?
Those of the sense sphere (kāmāvacara), those of the formless sphere (arūpāvacara), and the unincluded (apariyāpanna) — these phenomena are not of the form sphere.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.