Qur'an, Al-Insan, Surah 76:23-27
We revealed the Qur'an over a gradual period of time. (In the same manner) wait in patience as commanded by your Lord, and do not yield to the ways of the ungracious or the wicked. Remember your Lord in the morning and the evening, worshiping and prostrating yourselves before Him through the vigil of the night. Behold the unbelievers who love this fleeting life and remain forgetful of the Day of Anguish!