The Tipiṭaka in Three Languages

Ekādasakamātikā

Abhidhammapiṭaka · Dhammasaṅgaṇī · Vol. 34 · Section 530

[530] Which form (rūpa) is the space element (ākāsadhātu)? That which is space (ākāsa), what is reckoned as space; the void, what is reckoned as the void; a gap, what is reckoned as a gap; untouched by the four primary elements (mahābhūta) — this form is the space element.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places