The Hour will come so that each Person will be rewarded or punished in accordance with His Deeds
This is one of three Ayat -- there is no fourth -- where Allah commands His Messenger to swear by His Almighty Lord that the resurrection will surely come, because the stubborn followers of disbelief denied that it would happen.
- One of these Ayat is in Surah Yunus, where Allah says:
ويستنبيونك أحق هو قل إى وربى إنه لحق وما أنتم بمعجزين
And they ask you to inform them (saying): "Is it true!''
Say: "Yes! By my Lord! It is the very truth! and you cannot escape it!'' (10:53)
- The second of these Ayat is this one:
وقال الذين كفروا ﻻ تٲتينا الساعة قل بلى وربي لتٲتينكم
Those who disbelieve say: "The Hour will not come to us.''
Say: "Yes, by my Lord, it will come to you...''.
- And the third of them appears in Surah At-Taghabun, where Allah says:
زعم الذين كفروا أن لن يبعثوا قل بلى وربى لتبعثن ثم لتنبون بما عملتم وذلك على الله يسير
The disbelievers pretend that they will never be resurrected (for reckoning).
Say: "Yes! By my Lord, you will certainly be resurrected, then you will be informed of what you did; and that is easy for Allah.'' (64:7)
And Allah says here:
قل بلى وربي لتٲتينكم
Say: "Yes, by my Lord, it will come to you...''
Then Allah is described in a manner that affirms that:
عالم الغيب ﻻ يعزب عنه مثقال ذرة في السماوات وﻻ في اﻻرض وﻻ أصغر من ذلك وﻻ أكبر إﻻ في كتاب مبين
the All-Knower of the Unseen, not even the weight of a speck of dust or less than that or greater escapes His knowledge in the heavens or in the earth but it is in a Clear Book.
Mujahid and Qatadah said,
"Nothing is hidden or concealed from Him.''
In other words, everything is encompassed by His knowledge, and nothing is hidden from Him. Even though bones may be scattered and disintegrate, He knows where they have gone and where they have dispersed, then He will bring them back just as He created them in the first place, because He has knowledge of all things.
Then Allah tells us of His wisdom in re-creating bodies and bringing about the Hour, as He says:
ليجزي الذين آمنوا وعملوا الصالحات أوليك لهم مغفرة ورزق كريم