Samannaphalasutta 37.14

37.14

So evaṃ pabbajito samāno kāyena saṃvuto vihareyya, vācāya saṃvuto vihareyya, manasā saṃvuto vihareyya, ghāsacchādanaparamatāya santuṭṭho, abhirato paviveke.

Having gone forth they’d live restrained in body, speech, and mind, living content with nothing more than food and clothes, delighting in seclusion.