They will go round and around between it and boiling water.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (they go circling round between it) i.e. the fire (and fierce, boiling water) water as hot as can be.
Jalāl al-Dīn al-Maḥallī
تفسير : they shall pass round, they shall pace, between it and boiling hot water, [water] of extreme temperature, which they are given to drink every time they call to be rescued from the heat of the fire (ānin is defective, like qādin).