6:30
وَلَوْ تَرَىٰٓ إِذْ وُقِفُوا۟ عَلَىٰ رَبِّهِمْ ۚ قَالَ أَلَيْسَ هَٰذَا بِٱلْحَقِّ ۚ قَالُوا۟ بَلَىٰ وَرَبِّنَا ۚ قَالَ فَذُوقُوا۟ ٱلْعَذَابَ بِمَا كُنتُمْ تَكْفُرُونَ
If you could but see when they will be made to stand before their Lord. He will say, "Is this not the truth?" They will say, "Yes, by our Lord." He will [then] say, "So taste the punishment because you used to disbelieve."
Translation · Saheeh International
Tafsir
Ibn Kathīr (abridged)
Wishes and Hopes Do Not Help One When He Sees the Torment
Allah mentions the condition of the disbelievers when they are made to stand before the Fire on the Day of Resurrection and witness its chains and restraints, along with seeing the horrible, momentous conditions in the Fire with their own eyes. This is when the disbelievers will say,
يلَيْتَنَا نُرَدُّ وَلاَ نُكَذِّبَ بِـَايَـتِ رَبِّنَا وَنَكُونَ مِنَ الْمُؤْمِنِينَ
("Would that we were but sent back (to the world)! Then we would not deny the Ayat of our Lord, and we would be of the believers!") They wish that they would be sent back to the life of the world so that they could perform righteous deeds, refrain from disbelieving in the Ayat of their Lord and be among the believers. Allah said,
بَلْ بَدَا لَهُمْ مَّا كَانُواْ يُخْفُونَ مِن قَبْلُ
(Nay, what they had been concealing before has become manifest to them.) meaning, the disbelief, denial and rebellion that they used to hide in their hearts will then be uncovered, even though they will try to hide this fact in this life and the Hereafter. Earlier, Allah said,