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wa-rabbuka l-ghaniyyu dhū r-raḥmati ʾin yashaʾ yudhhibkum wa-yastakhlif min baʿdikum mā yashāʾu ka-mā ʾanshaʾakum min dhurriyyati qawmin ʾākharīna
Your Lord is the All-sufficient dispenser of mercy. If He wishes, He will take you away, and make whomever He wishes succeed you, just as He produced you from the descendants of another people.
— Ali Quli Qarai
Surah Al-‘An’am, Verses 133 - 134
133. "And your Lord Self-Sufficient, the Lord of Mercy, if He pleases, He may take you off; and make whom He pleases successors after you, just as He produced you from the descendants of other people."
134. "Verily what you are promised, will certainly come, and you cannot make (Allah) helpless (to flee from His retribution)."
In the previous verses the statement was about rewards justly and without atrocity given to the eligible persons. Here, in this verse, the Qur'an refers to the Mercy and Self -Sufficiency of Allah, both of which are reasons to His Justice. The verse says:
That is, your Lord is not in need of His servants and their worships. He is the owner of clemency. He bestows mercy upon people. He enjoins them to do some duties in order to deliver some great benefits to them. These benefits are not obtainable unless through the way of being eligible of them. This eligibility can be gained by means of fulfilling the divine duties accompanied with glorification and veneration unto Allah.
The Qur'an addresses the sinners and says that if Allah pleased He (S.w.T.) would destroy all of you. Then, after your destruction and your annihilation, He would appoint another group instead of you who should obey Him, just as the same form that He created you from the generation of other people who existed before you.
It is completely sure that whatever you are promised to, such as resurrection, reward and retribution, and the varieties of situations and differences that there are between the ranks of Heaven and the levels of Hell Fire, will certainly come, while you are not outside the sovereignty and realm of Allah.