Dhammapada · 1.8

Asubhānupassiṃ viharantaṃ, indriyesu susaṃvutaṃ;Bhojanamhi ca mattaññuṃ, saddhaṃ āraddhavīriyaṃ;Taṃ ve nappasahati māro, vāto selaṃva pabbataṃ.

Asubhanupassim viharantam, indriyesu susamvutam; Bhojanamhi ca mattannum, saddham araddhaviriyam; Tam ve nappasahati maro, vato selamva pabbatam.

The one who dwells contemplating the unattractive, with senses well-restrained, moderate in food, faithful and energetic — Mara cannot overpower them, as wind cannot move a mountain of rock.

— Dhammapada 1.8

Source: Pali text from the Khuddaka Nikāya of the Pali Canon (oldest extant Buddhist scripture, compiled c. 3rd century BCE). Public-domain English readings drawn from F. Max Müller's translation in Sacred Books of the East, Vol X (1881) and the Buddhist Publication Society's freely-licensed Acharya Buddharakkhita rendering.