Padasodhanavāra

Abhidhammapiṭaka · Yamaka (1) · Vol. 38 · Section 89

[89] "Are volitional formations (saṅkhārā) an aggregate (khandha)?" "Yes." "Are aggregates the form aggregate (rūpakkhandha)?" "The form aggregate is both an aggregate and the form aggregate; the remaining aggregates are aggregates, not the form aggregate."

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places