Jhānavibhaṅga › Suttantabhājanīya

Abhidhammapiṭaka · Vibhaṅga · Vol. 35 · Section 702

[702] "The sphere of nothingness (ākiñcaññāyatana)": the phenomena (dhammā) of mind (citta) and mental factors (cetasika) of one who has attained the sphere of nothingness, or of one who has been reborn [therein], or of one who dwells happily in the present life.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 1 other place

Vol. 35 · Section 692 — Suttantabhājanīya