Surah 36. Yasin, Ayah 56

In the Qur'anic descriptions of paradise, the term zill ("shade") and its plural zilal is often used as a metaphor for "happiness" - thus, for instance, in 4:57 , where zill zalil signifies "happiness abounding" (see surah {4}, note [74]) - while the "couches" on which the blessed are to recline are obviously a symbol of inner fulfilment and peace of mind, as pointed out by Razi in his comments on 18:31 and 55:54 .

Secondly, the joy or happiness is figured to be, not solitary, but shared by associates.