And [in part] of the night exalt Him and after prostration. (50:40)

Almuntakhab Fi Tafsir Alquran Alkarim

And at some part of the night and after the concluding part of prostrating yourself in the act of worship and the formal ending of prayer

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(50:40) and in the night, too, celebrate His glory, in the wake of prostration. *51

And [in part] of the night exalt Him and after prostration. meaning

*51) This is the means by which man gets the power and energy to continue his struggle to raise the Word of the Truth and to call the people towards righteousness throughout life with full determination even though he may have to pass through heart-breaking and soul-destroying conditions and his efforts may seem to be bearing no fruit. Praising and glorifying the Lord implies the Prayer here, and wherever in the Qur'an the praise and glorification has been associated with specific times, it implies the Prayer. The Prayer "before sunrise" is the Fajr Prayer, and the Prayers "before sunset" are the 'Asr and the Zuhr Prayers. The Prayers in the night are the Maghrib and the `Isha` Prayers, and the third, the Tahajjud Prayer, is also included in the glorification of the night. (For explanation, see E.N. 111 of Ta Ha; E.N.'s 23, 24 of Ar-Rum). As for the glorification that has been commanded after "being free from prostrations", it may imply the after-Prayer devotions as well as the offering of the voluntary prayers at the end of the prescribed obligatory Prayers. Hadrat Umar, Hadrat 'Ali, Hadrat Hasan bin 'Ali, hadrat Abu Hurairah, Ibn `Abbas, Sha`bi, Mujahid, 'Ikrimah, Hasan Basri, Qatadah, Ibrahim Nakha`i and Auza'i say that it implies the two rak ats after the Maghrib Prayer. Hadrat `Abdullah bin `Amr bin 'As, and according to a tradition, Hadrat `Abdullah bin 'Abbas also, held the opinion that it implies the after-Prayer devotions, and Ibn Zaid says -that the object of this Command is that voluntary Prayers also should be offered after the prescribed obligatory Prayers.
According to a tradition reported in Bukhari and Muslim, on the authority of Hadrat Abu Hurairah, once the poor emigrants from Makkah came before the Ho]y Prophet, and said "O Messenger of Allah, the rich people have attained high ranks for themselves The Holy Prophet asked: What has happened ? They said: They offer the Prayers as we offer, and they observe the Fasts as we observe; but they practise charity, which we cannot, and they set the slaves free which we cannot. The Holy Prophet said: Should I tell you a thing which if you practised, you would surpass all others, except those who practised the same that you practised? It is this that you should pronounce Subhan-Allah, al-Hamdu-lillah and Allah-u-Akbar, 33 times each after every Prayer. " After some time, the same people came and said: `Our rich brothers also have heard this and they too have started practising, it." Thereupon the Holy Prophet said: "This is Allah's bounty and He bestows it on whomever He wills." According to a tradition these devotional words have to be repeated ten times each instead of 33 times each.
Hadrat Zaid bin Thabit has reported that the Holy Prophet instructed his Companions that they should pronounce Subhan-Allah and al Hamdu-lillah 33 times each and Allah-u-Akbar 34 times after every Prayer. Afterwards an Ansar Companion submitted: "I have seen in a vision that somebody was telling me that it would be better if I pronounced these three devotional words 25 times each and then La ilaha ill-Allah 25 times. The Holy Prophet replied: Well, you may do likewise." (Ahmad, Nasa'i, Darimi).
Hadrat Abu Said Khudri says: 'I have heard the Holy Prophet pronounce the following words when he would return after the Praye rs were over: Subhana Rabbika Rabbil- `izzat-i `anima yasifun ' wa salam-un 'alal-mursalin, wal-hamdu lillah-i Rabb-il alamin. " (Jassas Ahkam al-Qur 'an).
Besides these, several other forms of the after-Prayer devotional pronouncements also have been reported from the Holy Prophet. Those who wish to act on this instruction of the Qur'an may select the one they find suitable from Mishkat.' Bab adh-dhikr 6a `d as-Salat, commit it to memory and practise it. Nothing can be better than what the Holy Prophet himself has taught in this regard. But what one should bear in mind is that the real object of the devotional pronouncements is not to utter these words only as a matter of course but to refresh and fix their meaning in the mind. Therefore, the meaning of whatever devotions one pronounces should be understood well and then practiced with full consciousness of the meaning.
 

And [in part] of the night exalt Him and after prostration. meaning in Urdu

اور رات کے وقت پھر اُس کی تسبیح کرو اور سجدہ ریزیوں سے فارغ ہونے کے بعد بھی