"Enter it in peace. This is the day of life abiding."
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : allah will say to them: (enter it) i.e. paradise (in peace) in safety from allah's chastisement. (this is the day of immortality) the day when the dwellers of paradise will enter paradise to abide therein for eternity.
Jalāl al-Dīn al-Maḥallī
تفسير : it will also be said to the god-fearing: ‘enter it in peace!, that is to say, secure from every fear, or [it means enter it] with a greeting, that is to say, greet [yourselves] and enter. that, day in which this entry takes place, is the day of immortality’, [of] everlastingness in paradise.