Hûd
IN THE NAME OF GOD, THE MOST GRACIOUS, THE DISPENSER OF GRACE[11:114]
And be constant in praying at the beginning and the end of the day, as well as during the early watches of the night: for, verily, good deeds drive away evil deeds: this is a reminder to all who bear [God] in mind.

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* v.114 : Lit., “at the two ends.”
* This injunction circumscribes all the obligatory prayers without specifying either their form or the exact times of their performance, both of which are clearly laid down in the sunnah (i.e., the authenticated sayings and the practice) of the Prophet: namely, at dawn (fajr), shortly after mid-day (zuhr), in the afternoon (‘asr), immediately after sunset (maghrib), and in the first part of the night (‘ishā’). Inasmuch as the above verse stresses the paramount importance of prayer in general, it is safe to assume that it refers not merely to the five obligatory prayers but to a remembrance of God at all times of one’s wakeful life.