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See surah {37}, note [22].
Zaqqûm is a tree that grows in the depths of Hell as mentioned in 37:62-65. The pagans of Mecca used to make fun of the Prophet and say, “How can a tree grow in Hell?”
Now follows a word-picture of the horrors to which Evil must lead us. What human language and what figures of speech can adequately describe them?
The opposite of "delicious Fruits" is the terrible tree of Zaqqam, which is further described in xxxvii. 62-68, where see n. 4073. Also see xvii. 60, n. 2250.