Duccaritasutta

Suttapiṭaka · Saṁyuttanikāya · Mahāvaggasaṁyutta · Vol. 19 · Section 831

[831] Then a certain bhikkhu approached the Blessed One … (and said): "It would be good, venerable sir, if the Blessed One would teach me the Dhamma in brief, so that, having heard the Dhamma from the Blessed One, I might dwell alone, withdrawn, heedful, ardent (ātāpī), and resolute."

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 1 other place

Vol. 19 · Section 750 — Uttiyasutta