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Surah 3. Aal-Imran
Ayah 88 - 91
88خَـٰلِدِينَ فِيهَا لَا يُخَفَّفُ عَنْهُمُ ٱلْعَذَابُ وَلَا هُمْ يُنظَرُونَ
89إِلَّا ٱلَّذِينَ تَابُوا۟ مِنۢ بَعْدِ ذَٰلِكَ وَأَصْلَحُوا۟ فَإِنَّ ٱللَّهَ غَفُورٌ رَّحِيمٌ
90إِنَّ ٱلَّذِينَ كَفَرُوا۟ بَعْدَ إِيمَـٰنِهِمْ ثُمَّ ٱزْدَادُوا۟ كُفْرًا لَّن تُقْبَلَ تَوْبَتُهُمْ وَأُو۟لَـٰٓئِكَ هُمُ ٱلضَّآلُّونَ
91إِنَّ ٱلَّذِينَ كَفَرُوا۟ وَمَاتُوا۟ وَهُمْ كُفَّارٌ فَلَن يُقْبَلَ مِنْ أَحَدِهِم مِّلْءُ ٱلْأَرْضِ ذَهَبًا وَلَوِ ٱفْتَدَىٰ بِهِۦٓ ۗ أُو۟لَـٰٓئِكَ لَهُمْ عَذَابٌ أَلِيمٌ وَمَا لَهُم مِّن نَّـٰصِرِينَ
[88-91] They shall remain under it for ever; neither will their punishment be lightened nor shall they be reprieved. However, those who repent after this and mend their ways will be redeemed; Allah is Forgiving and Compassionate. As for those who believed and then disbelieved and persisted in their disbelief;74 even their repentance shall not be accepted because they are obdurate transgressors. Believe it that if anyone of those who adopted disbelief and died as a disbeliever were to fill the whole earth with gold and offer it as ransom for redemption, that will not be accepted. There is a painful punishment in store for such people and they will not find any helpers.
74"They persisted in their disbelief" : they did not stop at the rejection of the Faith but went on further and further in their opposition and antagonism to it: they did their very worst to hinder people from the way of Allah by creating doubts and suspicions in their minds and by devising secret plans and plots to make the mission a failure.