(Al-Mudasir) 74 : 29
لَوَّاحَةٌ لِلْبَشَرِ
It will melt the skin of human beings.
it is told in verse 4: 56 that for the Fujjar who are the disbelievers, each time their skins will be melted away in the fire, it will be replaced with new skins so that they should taste the punishment in its full seriousness. See explanation 4: 140 and 70: 15-17.