Back 
Surah 9. Al-Tawba
Ayah 86 - 89
86 وَإِذَآ أُنزِلَتْ سُورَةٌ أَنْ ءَامِنُوا۟ بِٱللَّهِ وَجَـٰهِدُوا۟ مَعَ رَسُولِهِ ٱسْتَـْٔذَنَكَ أُو۟لُوا۟ ٱلطَّوْلِ مِنْهُمْ وَقَالُوا۟ ذَرْنَا نَكُن مَّعَ ٱلْقَـٰعِدِينَ
87 رَضُوا۟ بِأَن يَكُونُوا۟ مَعَ ٱلْخَوَالِفِ وَطُبِعَ عَلَىٰ قُلُوبِهِمْ فَهُمْ لَا يَفْقَهُونَ
88 لَـٰكِنِ ٱلرَّسُولُ وَٱلَّذِينَ ءَامَنُوا۟ مَعَهُۥ جَـٰهَدُوا۟ بِأَمْوَٰلِهِمْ وَأَنفُسِهِمْ ۚ وَأُو۟لَـٰٓئِكَ لَهُمُ ٱلْخَيْرَٰتُ ۖ وَأُو۟لَـٰٓئِكَ هُمُ ٱلْمُفْلِحُونَ
89 أَعَدَّ ٱللَّهُ لَهُمْ جَنَّـٰتٍ تَجْرِى مِن تَحْتِهَا ٱلْأَنْهَـٰرُ خَـٰلِدِينَ فِيهَا ۚ ذَٰلِكَ ٱلْفَوْزُ ٱلْعَظِيمُ
[86-89] Whenever a Surah was sent down with the revelation, "Believe in Allah and go forth for Jihad with His Messenger" , you might have perceived that even the capable people from among them began to beg you to excuse them from Jihad. saying, "Please leave us behind with those who are to stay at home. Those people chose to stay with those who had remained behind and a seal was set upon their hearts: therefore they do not understand anything now.89 But the Messenger and those who shared his belief did Jihad with their possessions and persons: now all the good things are for them only and they alone are truly successful. Allah has prepared for them Gardens underneath which canals flow wherein they will abide for ever: this is the great success.
89"...they do not understand anything now," for they deliberately and intentionally chose the shameful way of staying at home with women, when they were required to go forth for Jihad, though they were healthy, physically fit and well-to-do, and professed Islam. Therefore, according to the Divine Law of Nature. a seal was set upon their hearts and they were bereft of those noble feelings which make one feel ashamed of adopting such a disgraceful conduct.