Overall meaning : Allah Almighty states that if He were to punish people immediately for their unbelief, disobedience and the lies they attribute to Him, He would destroy them all and would not leave a single living being on earth. However, He, in His clemency, grants the wrongdoers respite for an appointed term. However, when the appointed time for their destruction comes, their punishment will neither be delayed nor advanced even by a single moment.
The idolaters who worship false deities besides Allah, He further states, attribute to Him daughters which they hate for themselves, and their tongues utter the lie that they will have the finest reward in this life and in the life to come. Allah disproves this false claim of theirs, threateningly saying: Without a doubt, for them is the Fire, into which they will be hastened on and in which they will be abandoned.
Then, giving solace to His Prophet, may Allah bless him and grant him peace, and helping make his heart firm, He says: By Allah, We have surely sent messengers to communities before you, Muhammad, but Satan made their unbelief and misdeeds look good to them, and so he will be their supporter on Judgement Day—but he will neither truly support them nor benefit them in any way—and they will suffer a painful punishment.

He further says to him: We have revealed to you the Qur’an only to make clear to people the natters of religion about which they have differed, and so that the Qur’an may serve as a guide and mercy for the believers.