Surah 18. Al-Kahf, Ayah 31

Like all other Qur'anic descriptions of happenings in the hereafter, the above reference to the "adornment" of the believers with gold and jewels and silk (cf. similar passages in 22:23 , 35:33 and 76:21 ) and their "reclining upon couches (ara'ik)" is obviously an allegory - in this case, an allegory of the splendour, the ever-fresh life (symbolized by "green garments"), and the restful fulfilment that awaits them in result of the many acts of self-denial which their faith had imposed on them during their earthly life. - Referring to the symbolism of these joys of paradise Razi draws our attention to the difference in the construction of the two parts of this clause: the first part is in the passive form ("they will be adorned...") and the second, in the active ("they will wear..."). In his opinion, the active form alludes to what the righteous will have earned by virtue of their deeds, whereas the passive form denotes all that will be bestowed on them by God above and beyond their deserts.

Heaven is figured by all the pictures of ease and comfort which we can imagine in our present state: Gardens: perpetual springs of crystal water, which we can see as in a landscape from above; the finest and most costly ornaments; the most beautiful clothes to wear; green is the colour mentioned, because it is the most refreshing to the eye, and fits in well with the Garden; the wearer takes the choice of fine silk or heavy brocade; and for rest and comfort, high thrones of dignity on which the blessed ones recline.

This picture is in parallel contrast to the picture of Misery in the last verse.