9:55
فَلَا تُعْجِبْكَ أَمْوَٰلُهُمْ وَلَآ أَوْلَٰدُهُمْ ۚ إِنَّمَا يُرِيدُ ٱللَّهُ لِيُعَذِّبَهُم بِهَا فِى ٱلْحَيَوٰةِ ٱلدُّنْيَا وَتَزْهَقَ أَنفُسُهُمْ وَهُمْ كَٰفِرُونَ
So let not their wealth or their children impress you. Allah only intends to punish them through them in worldly life and that their souls should depart [at death] while they are disbelievers.
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
فَلاَ تُعْجِبْكَ أَمْوَلُهُمْ وَلاَ أَوْلَـدُهُمْ
(So let not their wealth nor their children amaze you...) In similar Ayat, Allah said,
وَلاَ تَمُدَّنَّ عَيْنَيْكَ إِلَى مَا مَتَّعْنَا بِهِ أَزْوَجاً مِّنْهُمْ زَهْرَةَ الْحَيَوةِ الدُّنْيَا لِنَفْتِنَهُمْ فِيهِ وَرِزْقُ رَبِّكَ خَيْرٌ وَأَبْقَى
(And strain not your eyes in longing for the things We have given for enjoyment to various groups of them, the splendor of the life of this world, that We may test them thereby. But the provision (good reward in the Hereafter) of your Lord is better and more lasting) 20:131, and,
أَيَحْسَبُونَ أَنَّمَا نُمِدُّهُمْ بِهِ مِن مَّالٍ وَبَنِينَ - نُسَارِعُ لَهُمْ فِى الْخَيْرَتِ بَل لاَّ يَشْعُرُونَ
(Do they think that in wealth and children with which We enlarge them. We hasten unto them with good things. Nay, but they perceive not.) 23:55-56. Allah said next,