Qaf 50:40 ومن الليل فسبحه وادبار السجود ٤٠

وَمِنَ

ٱلَّيۡلِ

فَسَبِّحۡهُ

وَأَدۡبَٰرَ

ٱلسُّجُودِ

٤٠

And during a part of the night (also) glorify His praises (i.e. Maghrib and ‘Isha prayers) and (so likewise) after the prayers [As-Sunnah, Nawâfil - optional and additional prayers. And also glorify, praise and magnify Allâh - Subhân Allâh, Alhamdu lillâh, Allâhu-Akbar].

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Ibn Kathir (Abridged)

Warning the Disbelievers of the imminent Torment; commanding the Prophet to pray and have Patience

Allah the Exalted asks, `how many We have destroyed before these denying disbelievers'

مِّن قَرْنٍ هُمْ أَشَدُّ مِنْهُم بَطْشاً

(a generation who were stronger in power than they.) they were more numerous

…

Warning the Disbelievers of the imminent Torment; commanding the Prophet to pray and have Patience

Allah the Exalted asks, `how many We have destroyed

…

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Read in Context

Chapter 50, Page 520, Juz 26

36. And how many a generation We have destroyed before them who were stronger in power than they. And (when Our Torment came), they ran for a refuge in the land! Could they find any place of refuge (for them to save themselves from destruction)? 37. Verily, therein is indeed a reminder for him who has a heart or gives ear while he is heedful. 38. And indeed We created the heavens and the earth and all between them in six Days and nothing of fatigue touched Us. 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). 40. And during a part of the night (also) glorify His praises (i.e. Maghrib and ‘Isha prayers) and (so likewise) after the prayers [As-Sunnah, Nawâfil - optional and additional prayers. And also glorify, praise and magnify Allâh - Subhân Allâh, Alhamdu lillâh, Allâhu-Akbar]. 41. And listen on the Day when the caller will call from a near place. 42. The Day when they will hear As-Saihah (shout) in truth: that will be the Day of coming out (from the graves, i.e. the Day of Resurrection). 43. Verily, We it is Who give life and cause death; and to Us is the final return. 44. On the Day when the earth shall be cleft, from off them, (they will come out) hastening forth. That will be a gathering, quite easy for Us. 45. We know best what they say. And you (O Muhammad صلى الله عليه وسلم) are not the one to force them (to Belief). But warn by the Qur’an; him who fears My Threat.

- Al-Hilali & Khan