Padasodhanavāra

Abhidhammapiṭaka · Yamaka (1) · Vol. 38 · Section 48

[48] Is feeling (vedanā) the feeling aggregate (vedanākkhandha)? Yes. Are the aggregates (khandhā) the volitional formations aggregate (saṅkhārakkhandha)? The volitional formations aggregate is both an aggregate and the volitional formations aggregate; the remaining aggregates are aggregates, but not the volitional formations aggregate.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places