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, mightier than they and who constructed on the earth and built on it more than they. The statement of Allah the Exalted,
فَنَقَّبُواْ فِى الْبِلَـدِ هَلْ مِن مَّحِيصٍ
(And they went about the land! Could they find any place of refuge) Ibn `Abbas commented, "They left the traces throughout the land," Qatadah said, "They traveled throughout the land seeking provisions through trade and business, more than you have." Allah's statement,
وَسَبِّحْ بِحَمْدِ رَبِّكَ قَبْلَ طُلُوعِ الشَّمْسِ وَقَبْلَ الْغُرُوبِ (and proclaim His purity along with your Lord's praise before sunrise and before sunset... 50:39). The imperative verb sabbih is derived from the infinitive tasbih which originally means to declare or proclaim the purity of Allah. This comprehends the verbal declaration or proclamation and the worship, such as prayer. Therefore, some scholars say that tasbih before sunrise refers to the morning prayer, and tasbih before sunset refers to ` Asr (late afternoon) prayer. Sayyidna Jarir Ibn ` Abdullah ؓ reports from the Holy Prophet ﷺ [ as part of a long Tradition ]
"So if you can avoid missing the prayer before the sunrise and the prayer before sunset, that is the 'Asr prayer and the morning prayer, you must do so." (Bukhari and Muslim the wordings of Muslim: vide Qurtubi)
Although according to the majority of commentators, tasbih in the verse refers to salah (prayer), yet the general words of tasbih include all those invocations also the recitation of which is encouraged by authentic ahadith at the time of morning and evening. Bukhari and Muslim have recorded a Tradition on the authority of Sayyidna Abu Hurairah ؓ that the Holy Prophet ﷺ said:
"If you recite morning and evening سُبحَانَ اللہ subhanallah a hundred times, no one will bring, on the Day of Judgment, a virtuous act better than it, except those who would recite the same tasbih in the same number or even more than that."
In the same collections, a narration by the same authority, says that whosoever recites subhanallahi wa bi hamdihi one hundred times in a day, his sins will be forgiven, even though they may be more than the waves of the sea. (Mazhari)
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 37–39
Nations of the world progress and rise until they reach their zenith. But, when they are afflicted by God’s scourge, as a result of their misdeeds, they are reduced to such a condition that they cannot find any place in the world to which they can run away or in which they might take refuge. There are great lessons in these events of history. But lessons can be learnt only by one who is mentally alive so that he may derive their unspoken message from events, or by one in whom the capacity to hear is unimpaired, so that when divine messages are conveyed to him, they go straight to the core of his innermost being unimpeded.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.