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Surah 3. Aal-Imran
Ayah 86 - 89
٨٦. كَيْفَ يَهْدِى ٱللَّهُ قَوْمًا كَفَرُوا۟ بَعْدَ إِيمَـٰنِهِمْ وَشَهِدُوٓا۟ أَنَّ ٱلرَّسُولَ حَقٌّ وَجَآءَهُمُ ٱلْبَيِّنَـٰتُ ۚ وَٱللَّهُ لَا يَهْدِى ٱلْقَوْمَ ٱلظَّـٰلِمِينَ
٨٧. أُو۟لَـٰٓئِكَ جَزَآؤُهُمْ أَنَّ عَلَيْهِمْ لَعْنَةَ ٱللَّهِ وَٱلْمَلَـٰٓئِكَةِ وَٱلنَّاسِ أَجْمَعِينَ
٨٨. خَـٰلِدِينَ فِيهَا لَا يُخَفَّفُ عَنْهُمُ ٱلْعَذَابُ وَلَا هُمْ يُنظَرُونَ
٨٩. إِلَّا ٱلَّذِينَ تَابُوا۟ مِنۢ بَعْدِ ذَٰلِكَ وَأَصْلَحُوا۟ فَإِنَّ ٱللَّهَ غَفُورٌ رَّحِيمٌ
86. How shall Allah guide a people who disbelieved after their belief and after they bore witness that the Messenger is true and after clear proofs came to them And Allah guides not the people who are wrongdoers. 87. They are those whose recompense is that on them (rests) the curse of Allah, of the angels and of all mankind. 88. They will abide therein. Neither will their torment be lightened nor will it be delayed or postponed. 89. Except for those who repent after that and do righteous deeds. Verily, Allah is Oft-Forgiving, Most Merciful.
Ibn Jarir recorded that Ibn `Abbas said, "A man from the Ansar embraced Islam, but later reverted and joined the polytheists. He later on became sorry and sent his people to, `Ask the Messenger of Allah for me, if I can repent.' Then,
(How shall Allah guide a people who disbelieved after their belief) until,
(Verily, Allah is Oft-Forgiving, Most Merciful.) was revealed and his people sent word to him and he re-embraced Islam.''
This is the wording recorded by An-Nasa'i, Al-Hakim and Ibn Hibban. Al-Hakim said, "Its chain is Sahih and they did not record it.''
Allah's statement,
(How shall Allah guide a people who disbelieved after their belief and after they bore witness that the Messenger is true and after clear proofs came to them)
means, the proofs and evidences were established, testifying to the truth of what the Messenger was sent with. The truth was thus explained to them, but they reverted to the darkness of polytheism. Therefore, how can such people deserve guidance after they willingly leapt into utter blindness This is why Allah said,
(And Allah guides not the people who are wrongdoers.)
He then said,
(They are those whose recompense is that on them (rests) the curse of Allah, of the angels and of all mankind.)
Allah curses them and His creation also curses them.
(They will abide therein) in the curse,
(Neither will their torment be lightened nor will it be delayed or postponed.) for, the torment will not be lessened, not even for an hour. After that, Allah said,
(Except for those who repent after that and do righteous deeds. Verily, Allah is Oft-Forgiving, Most Merciful.)
This Ayah indicates Allah's kindness, graciousness, compassion, mercy and favor on His creatures when they repent to Him, for He forgives them in this case.