﴿ وَقَالَ ٱلَّذِينَ كَفَرُوا۟ لَا تَأْتِينَا ٱلسَّاعَةُ ۖ قُلْ بَلَىٰ وَرَبِّى لَتَأْتِيَنَّكُمْ عَٰلِمِ ٱلْغَيْبِ ۖ لَا يَعْزُبُ عَنْهُ مِثْقَالُ ذَرَّةٍۢ فِى ٱلسَّمَٰوَٰتِ وَلَا فِى ٱلْأَرْضِ وَلَآ أَصْغَرُ مِن ذَٰلِكَ وَلَآ أَكْبَرُ إِلَّا فِى كِتَٰبٍۢ مُّبِينٍۢ ﴾

“And yet, they who are bent on denying the truth assert, “Never will the Last Hour come upon us!” Say: “Nay, by my Sustainer! By Him who knows all that is beyond the reach of a created being’s perception: it will most certainly come upon you!” Not an atom’s weight [of whatever there is] in the heavens or on earth escapes His knowledge; and neither is there anything smaller than that, or larger, but is recorded in [His] clear decree,”

Commentary عَالِمِ الْغَيْبِ (the knower of the unseen). This is an attribute of the Rabb (Lord) in whose name an oath has been taken in verse 3. At this place, out of the many attributes of Allah Ta’ ala, the attribute of all-encompassing knowledge and the knowledge of the unseen has, perhaps, been mentioned particularly because the text is dealing with the matter of the deniers of the day of Resurrection. The major reason why the disbelievers rejected the inevitability of Qiyamah, the day of doom, was their inability to comprehend how the whole thing would work out. When all human beings die, and become dust, and the particles of this dust get scattered all over the world, they wondered, how would it be possible to collect all these particles, separate the particles belonging to each human being from the particles of all others, and then go on to put the relevant particles back into the frame of everyone's existence? And they took it as impossible because they had very conveniently taken the knowledge and power of Allah Ta’ ala on the analogy of their own knowledge and power! Allah Ta’ ala has told them that His knowledge encompasses the entire universe in a manner that He knows everything in the heavens and the earth to the extent that He also knows where and in what state it is. Not a single particle of what has been created remains outside His knowledge - and this comprehensive and all-encompassing knowledge is hallmark of Allah Ta’ ala. No created entity, whether an angel or prophet, can ever have such an all-encompassing knowledge that no particle of this universe remains outside it. Then, for a Being that has such an all-encompassing knowledge, why would it be difficult to reclaim the scattered particles of a human being from all over the universe, each separate from the other, and reconstitute their bodies from these once again?