MahāvaggavaggaSabbamatthītikathā

Abhidhammapiṭaka · Kathāvatthu · Vol. 37 · Section 332

[332] "Future form (rūpa) exists; future form does not abandon its state of being future?" "Yes." "Past form exists; past form does not abandon its state of being past?" "It should not be said thus. …"

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 4 other places