Qur'an, Al-Furqan, Surah 25:63-64
The faithful servants of the Beneficent walk upon the earth modestly, and when the ignorant address them, they say: "Peace!" They spend the night standing and prostrating before their Lord and say, "Lord, avert from us the doom of Hell, for its torment is everlasting. It is an evil resting place, a wretched abode indeed."