Aparihāniyasutta
“Catūhi, bhikkhave, dhammehi samannāgato bhikkhu abhabbo parihānāya nibbānasseva santike. Katamehi catūhi? Idha, bhikkhave, bhikkhu sīlasampanno hoti, indriyesu guttadvāro hoti, bhojane mattaññū hoti, jāgariyaṁ anuyutto hoti.
Non-decline
“Mendicants, a mendicant who possesses four qualities can’t decline, and has drawn near to extinguishment. What four? A mendicant is accomplished in ethics, guards the sense doors, eats in moderation, and is dedicated to wakefulness.