Mahāviyūhasuttaniddesa

Suttapiṭaka · Khuddakanikāya · Mahāniddesa · Vol. 29 · Section 650

[650] If, by another's disparagement, one were inferior, then no one would be distinguished among dhammas; for many speak of another's dhamma as low, while asserting firmly their own.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.