Tuvaṭakasuttaniddesa

Suttapiṭaka · Khuddakanikāya · Mahāniddesa · Vol. 29 · Section 765

[765] A bhikkhu should not be a boaster, nor should he utter speech prompted by ulterior motive; he should not train himself in impudence, nor should he speak contentious talk.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.