The Tipiṭaka in Three Languages

Suññatavāra

Abhidhammapiṭaka · Dhammasaṅgaṇī · Vol. 34 · Section 241

[241] What on that occasion is lightness of the mental body (kāyalahutā)? Whatever lightness, quickness in changing, absence of sluggishness, and absence of inertia of the aggregate of feeling (vedanākkhandha), the aggregate of perception (saññākkhandha), and the aggregate of volitional formations (saṅkhārakkhandha) there is on that occasion — this on that occasion is lightness of the mental body.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places