Read and reflect on verse 1328 from Surah At-Tawba: Only they may rightly be reproached who asked thee for exemption even though they were fully able [to go to war]. They were well-pleased to remain wit...
۞ إِنَّمَا السَّبِيلُ عَلَى الَّذِينَ يَسْتَأْذِنُونَكَ وَهُمْ أَغْنِيَاءُ ۚ رَضُوا بِأَنْ يَكُونُوا مَعَ الْخَوَالِفِ وَطَبَعَ اللَّهُ عَلَىٰ قُلُوبِهِمْ فَهُمْ لَا يَعْلَمُونَ
Only they may rightly be reproached who asked thee for exemption even though they were fully able [to go to war]. They were well-pleased to remain with those who were left behind -wherefore God has sealed their hearts, so that they do not know [what they are doing].