The discourse and regret of the disbelievers in Hell
This is in the Quran 67: 8-11
تَكَادُ تَمَيَّزُ مِنَ الْغَيْظِ كُلَّمَا أُلْقِيَ فِيهَا فَوْجٌ سَأَلَهُمْ خَزَنَتُهَا أَلَمْ يَأْتِكُمْ نَذِيرٌ . قَالُوا بَلَى قَدْ جَاءنَا نَذِيرٌ فَكَذَّبْنَا وَقُلْنَا مَا نَزَّلَ اللَّهُ مِن شَيْءٍ إِنْ أَنتُمْ إِلَّا فِي ضَلَالٍ كَبِيرٍ . وَقَالُوا لَوْ كُنَّا نَسْمَعُ أَوْ نَعْقِلُ مَا كُنَّا فِي أَصْحَابِ السَّعِيرِ . فَاعْتَرَفُوا بِذَنبِهِمْ فَسُحْقًا لِّأَصْحَابِ السَّعِيرِ
The explanation:
(As it [Hell] would tear up [from simmering] with rage.
Whenever a group [of unbelievers] is cast into it,
its keepers will ask them: "Has not ever [in the World] any warner come to [warn] you [of this punishment]?"
They will say: "Yes, indeed, a warner did come to us, but we denied [him] and said: 'God did never reveal anything; surely you [messengers] are in great error!' "
They [will] also say: "If we had only listened [to the words of the messengers or apostles] or had understood [that to which they invited us] we would not have been among the inhabitants of the Blaze."
They [will] then confess their sins [but their confession will not avail them at that time], and far [from God's mercy will] be the inhabitants of the Blaze.)