VaggaUppattikathā

Abhidhammapiṭaka · Kathāvatthu · Vol. 37 · Section 878

[878] Sakavādin: One is not a non-returner (anāgāmī) simultaneously with rebirth (upapatti)? Paravādin: Yes. Sakavādin: If one is not a non-returner simultaneously with rebirth, then truly, good sir, it should not be said: "One is an Arahant simultaneously with rebirth."

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 2 other places