repentance and regret

وَأَنذِرِ ٱلنَّاسَ يَوْمَ يَأْتِيهِمُ ٱلْعَذَابُ فَيَقُولُ ٱلَّذِينَ ظَلَمُوا۟ رَبَّنَآ أَخِّرْنَآ إِلَىٰٓ أَجَلٍ قَرِيبٍ نُّجِبْ دَعْوَتَكَ وَنَتَّبِعِ ٱلرُّسُلَ ۗ أَوَلَمْ تَكُونُوٓا۟ أَقْسَمْتُم مِّن قَبْلُ مَا لَكُم مِّن زَوَالٍ

And, [O Muḥammad], warn the people of a Day when the punishment will come to them and those who did wrong will say, "Our Lord, delay us for a short term; we will answer Your call and follow the messengers." [But it will be said], "Had you not sworn, before, that for you there would be no cessation?

تَٱللَّهِ إِن كُنَّا لَفِى ضَلَـٰلٍ مُّبِينٍ

"By Allāh, we were indeed in manifest error