Ibn Kathir (Abridged)
Hafiz Ibn KathirThe Recompense of the Righteous and the Unrighteous
Allah said to His Prophet , when the disbelievers asked him to hasten on the punishment for them:قُلْ يأَيُّهَا النَّاسُ إِنَّمَآ أَنَاْ لَكُمْ نَذِيرٌ مُّبِينٌ (Say: "O mankind! I am (sent) to you only as a plain warner.") meaning, `Allah has sent me to you to warn you ahead of the terrible punishment, but I have nothing to do with your reckoning. Your case rests with Allah: if He wills, He will hasten on the punishment for you; and if He wills, He will delay it for you. If He wills he will accept the repentance of those who repent to Him; and if He wills, He will send astray those who are decreed to be doomed. He is the One Who does whatsoever He wills and wants and chooses.لاَ مُعَقِّبَ لِحُكْمِهِ وَهُوَ سَرِيعُ الْحِسَابِ(There is none to put back His judgement and He is swift at reckoning.) 13:41إِنَّمَآ أَنَاْ لَكُمْ نَذِيرٌ مُّبِينٌفَالَّذِينَ ءَامَنُواْ وَعَمِلُواْ الصَّـلِحَـتِ(I am (sent) to you only as a plain warner.
So those who believe and do righteous good deeds,) means, whose hearts believe and whose actions confirm their faith.لَّهُم مَّغْفِرَةٌ وَرِزْقٌ كَرِيمٌ(for them is forgiveness and Rizq Karim. ) means, forgiveness for their previous bad deeds, and a great reward in return for a few good deeds. Muhammad bin Ka`b Al-Qurazi said, "When you hear Allah's saying:وَرِزْقٌ كَرِيمٌ(Rizq Karim) this means Paradise."وَالَّذِينَ سَعَوْاْ فِى ءَايَـتِنَا مُعَـجِزِينَ(But those who strive against Our Ayat to frustrate them,) Mujahid said, "To discourage people from following the Prophet ." This was also the view of `Abdullah bin Az-Zubayr, "to discourage." Ibn `Abbas said, "To frustrate them means to resist the believers stubbornly."أُوْلَـئِكَ أَصْحَـبُ الْجَحِيمِ(they will be dwellers of the Hellfire.) This refers to the agonizingly hot Fire with its severe punish- ment, may Allah save us from it.
Allah says:الَّذِينَ كَفَرُواْ وَصَدُّواْ عَن سَبِيلِ اللَّهِ زِدْنَـهُمْ عَذَابًا فَوْقَ الْعَذَابِ بِمَا كَانُواْ يُفْسِدُونَ (Those who disbelieved and hinder (men) from the path of Allah, for them We will add torment to the torment because they used to spread corruption) 16:88