Suññatavāra

Abhidhammapiṭaka · Dhammasaṅgaṇī · Vol. 34 · Section 121

[121] Which, on that occasion, is the mind-consciousness element (manoviññāṇa-dhātu)? … This, on that occasion, is the mind-consciousness element.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places