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Surah 40. Ghafir
Ayah 82 - 85
82أَفَلَمْ يَسِيرُوا۟ فِى ٱلْأَرْضِ فَيَنظُرُوا۟ كَيْفَ كَانَ عَـٰقِبَةُ ٱلَّذِينَ مِن قَبْلِهِمْ ۚ كَانُوٓا۟ أَكْثَرَ مِنْهُمْ وَأَشَدَّ قُوَّةً وَءَاثَارًا فِى ٱلْأَرْضِ فَمَآ أَغْنَىٰ عَنْهُم مَّا كَانُوا۟ يَكْسِبُونَ
83فَلَمَّا جَآءَتْهُمْ رُسُلُهُم بِٱلْبَيِّنَـٰتِ فَرِحُوا۟ بِمَا عِندَهُم مِّنَ ٱلْعِلْمِ وَحَاقَ بِهِم مَّا كَانُوا۟ بِهِۦ يَسْتَهْزِءُونَ
84فَلَمَّا رَأَوْا۟ بَأْسَنَا قَالُوٓا۟ ءَامَنَّا بِٱللَّهِ وَحْدَهُۥ وَكَفَرْنَا بِمَا كُنَّا بِهِۦ مُشْرِكِينَ
85فَلَمْ يَكُ يَنفَعُهُمْ إِيمَـٰنُهُمْ لَمَّا رَأَوْا۟ بَأْسَنَا ۖ سُنَّتَ ٱللَّهِ ٱلَّتِى قَدْ خَلَتْ فِى عِبَادِهِۦ ۖ وَخَسِرَ هُنَالِكَ ٱلْكَـٰفِرُونَ
[82-85] Well,111 have they not traveled in the earth that they could see the fate of those who have gone before them? They were more in number and stronger-in might and have left behind greater traces of their power in the land; yet what they earned did not avail them anything. When their Messengers came to them with clear Signs, they remained stuck to the knowledge that they already had,112 and then were encompassed by the same thing that they mocked. When they saw Our scourge, they cried out, "We now believe in Allah, the One, and we reject all those gods whom we used to associate with Him." But after having seen Our scourge, their belief could be of no avail to them, because the same has been the standing law of Allah to deal with His servants, in the past,113 and then the disbelievers only incurred loss.
111This is the conclusion to the discourse. While studying this please also keep in view vv. 4-5 and v. 21 of this Surah.
112That is, "They took their philosophy and their science, their law, their secular sciences and their mythology and theology invented by their religious guides as the real knowledge, and regarded the Knowledge brought by the Prophets of Allah as worthless and therefore paid no heed to it. "
113"The standing Law of Allah" : the Law that repentance and faith are beneficial only till the time man is not seized by the torment of Allah or death. Believing or repenting after the torment has arrived or the signs of death have appeared, is not acceptable to Allah.