Their greeting on the day they meet Him will be: "Peace;" and He has a generous reward ready for them.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (their salutation) the believers' salutation (on the day when they shall meet him will be: peace) from allah and the angels will greet them at the gates of paradise. (and he hath prepared for them a goodly recompense) a fair reward in paradise.
Jalāl al-Dīn al-Maḥallī
تفسير : their greeting, from him, exalted be he, on the day they encounter him will be ‘peace’, [extended to them] by the tongues of the angels. and he has prepared for them a noble reward, namely, paradise.