The Children of Israel
IN THE NAME OF GOD, THE MOST GRACIOUS, THE DISPENSER OF GRACE[17:79]
And rise from thy sleep and pray during part of the night [as well], as a free offering from thee, and thy Sustainer may well raise thee to a glorious station [in the life to come].

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* v.79 : Lit., “as a deed beyond that which is incumbent on thee” (nāfilatan laka) – i.e., in addition to the five obligatory prayers. Hence, the above is not an injunction but a recommendation, although the Prophet himself invariably spent the greater part of the night in prayer.