يَطُوفُونَ بَيْنَهَا وَبَيْنَ حَمِيمٍ ءَانٍ
Yatoofoona bainahaa wa baina hameemim aan
They will circle between it and scalding, boiling water.
Yaṭūfūna is the circling verb, the one used of the circuit around the Kaaba and of the youths who go round serving in the garden. Here the same motion has the guilty driven back and forth between the fire and water at the exact peak of its heat, since ān names the point where a thing reaches its utmost. The refrain frames the verse, asking after blessings on both sides of it.