And indeed, the recompense is to occur. (51:6)

Almuntakhab Fi Tafsir Alquran Alkarim

And that the final trial of mankind at the end of the world is indeed an inevitable event that shall fall to. their lot

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

(51:6) and the Judgement shall doubtlessly take place. *4

And indeed, the recompense is to occur. meaning

*4) This is the thing for which the oath has been sworn. The oath implies this: The unique order and regularity with which the wonderful system of the rain is functioning before your eyes, and the wisdom and good reasons which clearly underlie it, testify to the reality that this world is not a meaningless and useless toy-house where the great drama of life is being presented at random since millions and millions of years. Hut, it is, in fact, a wise system of the highest order in which everything that happens has a purpose and reason behind it. In this system it is not possible that n creature like man should have been given intellect, sense and the powers to exploit _ things to advantage, should have been granted moral sense to distinguish the good and evil, right and wrong deeds and then might have ban left alone foolishly and meaninglessly in the world to behave as he pleased, and that he should never be questioned as to how he had used and employed the powers of the heart and mind and body, the vast means placed at his disposal w work in the world, and the power and authority granted to him to employ the countless creatures of God to advantage. In this system of the Universe where everything is purposeful, how can the creation of a unique being like man only be purposeless? In a system where everything is based on wisdom, how can the creation of man only be useless and futile? The purpose of the creation of those things which do not possess consciousness and intellect is fulfilled in this very physical world. Therefore, it would be right and reasonable if they were destroyed after they had reached the end of their life term, for they have not been granted any powers and authority for which they might have to be called to account. But a creature which possesses intellect and consciousness and authority, whose activities are not confined only to the physical world, but are also moral in nature, and whose actions entailing moral consequences do not take place only till the end of life, but continue to register their moral effects on it even after death, cannot be destroyed like plants and animals just after it has fulfilled the function of its physical existence. Whatever good or evil act he has committed by his own will and choice, he must get the reward 'or suffer the punishment for it justly and equitably, for this is the basic requirement of the factor under which, contrary to other creatures, he has been endowed with the freedom of choice and will. If he is not held accountable, if he is not rewarded or punished according to his moral acts, and if he also is destroyed at the conclusion of his physical life like the creatures which have been given no freedom of will and choice, his creation would inevitably be altogether futile, and a Wise Being cannot be expected to indulge in a futile exercise.
Besides, there is also another reason for swearing an oath by these four phenomena of the Universe regarding the occurrence of the Hereafter and the meting out of rewards and punishments. The ground on which the deniers of the Hereafter regard the life after death as impossible is this: When we are mixed up with dust after death and our particles have scattered away in the earth, how can it be possible that all these scattered particles of the body are reassembled and we are made to rise up again? The error of this apprehension is by itself removed when we consider deeply the four phenomena of the Universe, which have been presented as an argument for the Hereafter. The rays of the sun have their effect on aII the collections of water on the surface of the earth, where their heat reaches. In this process countless drops of water evaporate from the collection, but they do not become extinct, and every drop remains preserved in the air as vapors. When Allah commands the same wind gathers the same vapors of the drops together, combines them into thick clouds, spreads those clouds on different parts of the earth and precisely at the time appointed by Allah causes each single drop to fall back to the earth in the form as it was in the beginning. This phenomenon that is occurring before the eyes of man daily testifies that the particles of the bodies of the dead men can also gather together at one command by Allah and the men can be raised up in the shape in which they lived before. Whether these particles are in the dust, or in the water, or in the air, in any case they remain preserved in this very earth and its atmosphere. Why should it be difficult for the God Who gathers together the vapors of water after they had dispersed in the air, by means of the same air, and then causes them to rain as water, to gather together the scattered particles of the human bodies from the air, water and earth and then combine them in their original form and shape?
 

And indeed, the recompense is to occur. meaning in Urdu

اور جزائے اعمال ضرور پیش آنی ہے