Translation of the verse 45 from Surah Ad-Dukhan : Number of verses 59 - - page 498 - Part 25.
Like boiling oil, it will boil in the bellies,
Like murky oil, it boils within bellies
(44:45) Like dregs of oil, *39 it will boil in their bellies
*39) The word al--muhl in the original has several meanings: molten metal, pus-blood, molten tar, lava, dregs of oil. These are the different meanings given by the lexicographers and commentators, but if this word is understood with reference to zaqqum (cactus), it may mean its juice which will probably be like the dregs of oil.
Source : Ad-Dukhan Verse 45: Like murky oil, it boils within bellies