Dhammapadaṃ, 1. Yamakavaggo (The Pairs), Verse 8

asubhānupassiṃ viharantaṃ | indriyesu susaṃvutaṃ ||
bhojanamhi ca mattaññuṃ | saddhaṃ āraddhavīriyaṃ ||
taṃ ve nappasahati māro | vāto selaṃva pabbataṃ || 8 ||

8. Contemplating unpleasant things, living well controlled in his
      senses,
and knowing moderation in eating, having faith, putting forth energy,
him indeed Māra does not overcome, as the wind does not overcome
      a rocky mountain.

-- Translation by K.R. Norman from The Word of the Doctrine, p. 1,
    The Pali Text Society, 2000