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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 ('isha'). 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.
This verse talks about the five daily prayers. The prayers at the two ends of the day are the dawn prayer (Fajr) at one end and the afternoon prayers (Ẓuhr and ’Aṣr) at the other. Prayers in the early part of the night include the sunset (Maghrib) and late evening (’Ishâ') prayers.
Approaches of the night: Zulafun, plural of Zulfatun, an approach, something near at hand. As Arabic has, like Greek, a dual number distinct from the plural, and the plural number is used here, and not the dual, it is reasonable to argue that at least three "approaches of the night" are meant. The late afternoon prayer, 'Asr, can be one of these three, and the evening prayer, Magrib, just after sunset, can be the second. The early night prayer, 'Isha, at supper time-when the glow of sunset is disappearing, would be the third of the "approaches of the night", when we commit ourselves to Allah before sleep. These are the five canonical prayers of Islam.
"Those things that are good": in this context the words refer primarily to prayers, but they include all good thoughts, good words, and good deeds. It is by them that we keep away everything that is evil, whether referring to the past, the present, or the future.
The two ends of the day: Morning and afternoon. The morning prayer is the Fajr, after the light is up but before sunrise: we thus get up betimes and begin the day with the remembrance of Allah and of our duty to Him. The early afternoon prayer, Zuhr, is immediately after noon: we are in the midst of our daily life, and again we remember Allah. There is no disagreement among scholars regarding which prayer is meant by one of these two ends of the day. They agree that it is Fajr prayer which may be performed from dawn until a little before sunrise. There is disagreement, however, regarding the prayer which ought to be performed at the other end of the day. It is said variously that the reference is to Asr or Maghrib prayer.