Abbas - Tanwîr al-Miqbâs min Tafsîr Ibn ‘Abbâs
(Allah hath made ready for them Gardens underneath which) beneath its trees and habitations (rivers) rivers of wine, water, honey and milk (flow, wherein they will abide) they will dwell in Paradise: never to die or be removed. (That) which I have mentioned (is the Supreme Triumph) the abounding safety: they earned Paradise and that which is in it and were saved from hell and that which is in it.
(But the Messenger and those who believed with him strove hard and fought) until the end of these two Ayat 9:88-89. This describes the qualities, as well as, the reward of faithful believers. Allah said,
وَأُوْلَـئِكَ لَهُمُ الْخَيْرَاتُ
(Such are they for whom are the good things), in the Hereafter, in the gardens of Al-Firdaws and the high grades.
Maududi - Sayyid Abul Ala Maududi - Tafhim al-Qur'an
"...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.