La yathooqoona feeha almawta illa almawtata al-oola wawaqahum AAathaba aljaheem (surah Ad Dukhaan: 56)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(44:56) They shall not taste death except the death in this world. And Allah will save them from the chastisement of Hell *44

Laa yazooqoona feehal mawtaa illal mawtatal oolaa wa qaqaahum `azaabal jaheem

*44) Two things are worthy of notice in this verse.
First, after mentioning the blessings of Paradise special mention has been made of being secure from Hell separately whereas a person's entry into Paradise by itself amounts to his being safe from Hell. This is because man can feel the worth of the reward of obedience fully only when he is informed what end the disobedient people have met and from what evil end he himself has ban saved.
Secondly, Allah is mentioning those people's safety from Hell and their entry into Paradise as a result of His own grace. This is meant to warn man of the truth that this success cannot be achieved by any person unless he is blessed by Allah's grace. Although man will be rewarded for his own good deeds, in the first place he cannot do good unless favoured by Allah's succour; then even the best deed that man is able to perform, cannot be absolutely perfect and none can claim that it is flawless and faultless. It is only Allah's bounty that He should overlook the servant's weaknesses and defects in his actions and accept his services and bless him with rewards; otherwise if He resorts to minute accountability no one can dare claim to win Paradise only on the strength of his own deeds. The same thing has been said by the Holy Prophet in a Hadith to the effect: "Act and try to act as righteously as you possibly can, but know that the action of a person alone will not make him enter Paradise. It was asked: What about your own action, O Messenger of Allah? He replied: Yes, even I won't enter Paradise on the strength of my actions, unless of course, my Lord covers me up in His mercy."