40:21
۞ أَوَلَمْ يَسِيرُوا۟ فِى ٱلْأَرْضِ فَيَنظُرُوا۟ كَيْفَ كَانَ عَـٰقِبَةُ ٱلَّذِينَ كَانُوا۟ مِن قَبْلِهِمْ ۚ كَانُوا۟ هُمْ أَشَدَّ مِنْهُمْ قُوَّةً وَءَاثَارًا فِى ٱلْأَرْضِ فَأَخَذَهُمُ ٱللَّهُ بِذُنُوبِهِمْ وَمَا كَانَ لَهُم مِّنَ ٱللَّهِ مِن وَاقٍ
Have they not traveled through the land and observed how was the end of those who were before them? They were greater than them in strength and in impression on the land, but Allah seized them for their sins. And they had not from Allah any protector.
Context in Surah Ghafir
Nearby ayahs help place verse 40:21 in sequence and meaning.
يَعْلَمُ خَآئِنَةَ ٱلْأَعْيُنِ وَمَا تُخْفِى ٱلصُّدُورُ
He knows that which deceives the eyes and what the breasts conceal.
وَٱللَّهُ يَقْضِى بِٱلْحَقِّ ۖ وَٱلَّذِينَ يَدْعُونَ مِن دُونِهِۦ لَا يَقْضُونَ بِشَىْءٍ ۗ إِنَّ ٱللَّهَ هُوَ ٱلسَّمِيعُ ٱلْبَصِيرُ
And Allah judges with truth, while those they invoke besides Him judge not with anything. Indeed, Allah - He is the Hearing, the Seeing.
ذَٰلِكَ بِأَنَّهُمْ كَانَت تَّأْتِيهِمْ رُسُلُهُم بِٱلْبَيِّنَـٰتِ فَكَفَرُوا۟ فَأَخَذَهُمُ ٱللَّهُ ۚ إِنَّهُۥ قَوِىٌّ شَدِيدُ ٱلْعِقَابِ
That was because their messengers were coming to them with clear proofs, but they disbelieved, so Allah seized them. Indeed, He is Powerful and severe in punishment.
وَلَقَدْ أَرْسَلْنَا مُوسَىٰ بِـَٔايَـٰتِنَا وَسُلْطَـٰنٍ مُّبِينٍ
And We did certainly send Moses with Our signs and a clear authority