Those Who Set The Ranks - 37:65 Its buds are like the heads of devils.
In the context of verses 62, 63...67; They eat from the tree of Zaqqum:
Those Who Set The Ranks/37:62 Is this a better abode or the tree of oleander?
Those Who Set The Ranks/37:63 We have made it a test for the wrongdoers.
Those Who Set The Ranks/37:64 It is a tree from the bottom of Hell.
Those Who Set The Ranks/37:65 Its buds are like the heads of devils.
Those Who Set The Ranks/37:66 They will fill their bellies by eating from it.
Those Who Set The Ranks/37:68 Then their return is to Hell.

The Event/56:51 Then you, O you who have gone astray, O you deniers
The Event/56:52 You will eat of the tree of Zaqqum.
The Event/56:54 And you will drink boiling water on it.
The Event/56:56 This is how they will be entertained on the Day of Judgment.

The Smoke/44:45 Like concentrated acid and will boil in the stomachs

Prophet Abraham/14:16 Then hell. They will be made to drink tainted water
Prophet Abraham/14:17 He will try to swallow it, but he will not be able to choke it down. Death will come to him from all sides, but he will not die. And a severe torment will follow.