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Abhidhammapiṭaka · Vibhaṅga · Vol. 35 · Section 697

[697] "The sphere of infinite consciousness (viññāṇañcāyatana)": the phenomena (dhammā) of mind (citta) and mental factors (cetasika) of one who has attained the sphere of infinite consciousness, or of one who has been reborn [therein], or of one who dwells in happiness 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English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.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 707 — Suttantabhājanīya