As for those of the right hand -- how (happy) those of the right hand --
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (and those on the right hand) the inhabitants of paradise; (what of those on the right hand) and what do you know, o muhammad, about the bliss and happiness of the people of paradise?
Jalāl al-Dīn al-Maḥallī
تفسير : and those of the right [hand] — what of those of the right [hand]?