(Ar-Rahman) 55 : 44
يَطُوفُونَ بَيْنَهَا وَبَيْنَ حَمِيمٍ آنٍ

They will be wandering to and fro between it and the hot boiling water.

See explanation 37: 62-68; 38: 55-58; and 44: 44-49.