رَّبُّكُمْ أَعْلَمُ بِكُمْ ۖ إِن يَشَأْ يَرْحَمْكُمْ أَوْ إِن يَشَأْ يُعَذِّبْكُمْ ۚ وَمَا أَرْسَلْنَاكَ عَلَيْهِمْ وَكِيلًا (54)
(17:54) Your Lord is fully aware of everything concerning you. If He will, He may show mercy to you, and if He will, He may give you severe chastisement. " *60 And, O Prophet, We have not sent you to be the guardian over people *61 .
*60) This is to warn the believers to refrain from making claims of piety so as to assign Paradise to themselves and Hell to their opponents. It is Allah alone Who has the power to decide these things because He is fully aware of the known and secret and the present and future things about all human beings. It is He Who will decide whether to show mercy to anyone or give chastisement. However, a man may say in the light of the Divine Book that a certain kind of human beings deserve mercy and another kind of people incur chastisement but none has any right to say specifically that a particular man will be given chastisement and another will get salvation.
*61) This is to declare that a Prophet is sent to convey the Message and not to decide whether a person will receive mercy or get chastisement. It does not, however, mean that, God forbid, the Holy Prophet himself did such a thing and Allah had to warn him. In fact, this is to warn the Muslims that when the Prophet himself is not .in a position as to decide the fates of the people, they should never think of such a thing as to assign Paradise and Hell to anyone.