Mahāvagga

Suttapiṭaka · Khuddakanikāya · Paṭisambhidāmagga · Vol. 31 · Section 175

[175] What is the unincluded (apariyāpannā) plane (bhūmi)? The unincluded paths (magga) and fruits (phala), and the unconditioned element (asaṅkhatā dhātu) — this is the unincluded plane. These are the four planes.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.