Reflection and contemplation (taddabur)

فَٱنتَقَمْنَا مِنْهُمْ ۖ فَٱنظُرْ كَيْفَ كَانَ عَـٰقِبَةُ ٱلْمُكَذِّبِينَ

So We took retribution from them; then see how was the end of the deniers.

۞ أَفَلَمْ يَسِيرُوا۟ فِى ٱلْأَرْضِ فَيَنظُرُوا۟ كَيْفَ كَانَ عَـٰقِبَةُ ٱلَّذِينَ مِن قَبْلِهِمْ ۚ دَمَّرَ ٱللَّهُ عَلَيْهِمْ ۖ وَلِلْكَـٰفِرِينَ أَمْثَـٰلُهَا

Have they not traveled through the land and seen how was the end of those before them? Allāh destroyed [everything] over them, and for the disbelievers is something comparable.