39. So bear with patience (O Muhammad صلى الله عليه وسلم) all that they say, and glorify the Praises of your Lord, before the rising of the sun and before (its) setting (i.e. the Fajr, Zuhr, and ‘Asr prayers)[1].
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(V.50:39).
a) Narrated Qais: Jarîr said, "We were with the Prophet صلى الله عليه وسلم and he looked at the moon on a full-moon night and said: ‘Certainly you will see your Lord as you see this moon and you will have no trouble in seeing Him. So if you can avoid missing (through sleep or business) a prayer before the sunrise (Fajr) and a prayer before sunset (‘Asr ), you must do so’. ‘He then recited Allah’s Statement:
"And glorify the praises of your Lord before the rising of the sun, and before (its) setting." (V.50:39).
Ismâ‘îl said: "Offer those prayers and do not miss them." (Sahih Al-Bukhari, Vol.1, Hadîth No.529)
b) See the footnote of (V.32:16).