In the WildernessĀraññakasutta

“Mendicants, a mendicant practicing mindfulness of breathing who has five things will soon penetrate the unshakable.“Pañcahi, bhikkhave, dhammehi samannāgato bhikkhu ānāpānassatiṁ bahulīkaronto nacirasseva akuppaṁ paṭivijjhati. What five?Katamehi pañcahi? It’s when a mendicant has few obligations and duties, and is unburdensome and contented with life’s necessities.Idha, bhikkhave, bhikkhu appaṭṭho hoti appakicco subharo susantoso jīvitaparikkhāresu; They eat little, not devoted to filling their stomach.appāhāro hoti anodarikattaṁ anuyutto; They are rarely drowsy, and are dedicated to wakefulness.appamiddho hoti jāgariyaṁ anuyutto; They live in the wilderness, in remote lodgings.āraññako hoti pantasenāsano; They review the extent of their mind’s freedom.yathāvimuttaṁ cittaṁ paccavekkhati. A mendicant practicing mindfulness of breathing who has these five things will soon penetrate the unshakable.”Imehi kho, bhikkhave, pañcahi dhammehi samannāgato bhikkhu ānāpānassatiṁ bahulīkaronto nacirasseva akuppaṁ paṭivijjhatī”ti.