Mahāviyūhasuttanidadesa

Suttapiṭaka · Khuddakanikāya · Mahāniddesa · Vol. 29 · Section 602

[602] **"They assert: 'This alone is true'"** means: they say, declare, speak, explain, and express: "The world is eternal; this alone is true, anything else is vain." They say, declare, speak, explain, and express: "The world is not eternal … the Tathāgata after death neither exists nor does not exist; this alone is true, anything else is vain." Therefore it is said: "They assert: 'This alone is true.'"

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 1 other place

Vol. 29 · Section 310 — Pasūrasuttanidesanidadesa