فَلَا تُعْجِبْكَ أَمْوَٰلُهُمْ وَلَآ أَوْلَـٰدُهُمْ ۚ إِنَّمَا يُرِيدُ ٱللَّهُ لِيُعَذِّبَهُم بِهَا فِى ٱلْحَيَوٰةِ ٱلدُّنْيَا وَتَزْهَقَ أَنفُسُهُمْ وَهُمْ كَـٰفِرُونَ
“So let neither their wealth nor children impress you [O Prophet]. Allah only intends to torment them through these things in this worldly life, then their souls will depart while they are disbelievers.”
Part of the well-established hypocrites-who-stayed-behind-from-Tabuk passage of Surat al-Tawbah.