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As explained by Razi in his comments on the above verse as well as on 18:31 and 55:54 , the "reclining on couches" or "on carpets" in paradise is a symbol of inner fulfilment and peace of mind; and he points out that this is also alluded to in the identity of the verbal root sarra ("he was [or "became"] happy") in both the nouns surur ("happiness") and sarir ("couch").
For an explanation of the expression hur'in, see surah {56}, note [8].
Every one will have a couch of dignity, but it does not follow that the dignity will be the same. Every one's Personality will be purified but it will not be merged into one general sameness.
Cf. xliv. 54, and notes 4728 and 4729, where the meaning of Hur is fully explained. This is the special sharing of individual Bliss one with another. The next verse refers to the general social satisfaction shared with all whom we loved in this earthly life.