consequences of negligence

قَدْ خَسِرَ ٱلَّذِينَ كَذَّبُوا۟ بِلِقَآءِ ٱللَّهِ ۖ حَتَّىٰٓ إِذَا جَآءَتْهُمُ ٱلسَّاعَةُ بَغْتَةً قَالُوا۟ يَـٰحَسْرَتَنَا عَلَىٰ مَا فَرَّطْنَا فِيهَا وَهُمْ يَحْمِلُونَ أَوْزَارَهُمْ عَلَىٰ ظُهُورِهِمْ ۚ أَلَا سَآءَ مَا يَزِرُونَ

Those will have lost who deny the meeting with Allāh, until when the Hour [of resurrection] comes upon them unexpectedly, they will say, "Oh, [how great is] our regret over what we neglected concerning it [i.e., the Hour]," while they bear their burdens [i.e., sins] on their backs. Unquestionably, evil is that which they bear.

فَلَمَّا نَسُوا۟ مَا ذُكِّرُوا۟ بِهِۦٓ أَنجَيْنَا ٱلَّذِينَ يَنْهَوْنَ عَنِ ٱلسُّوٓءِ وَأَخَذْنَا ٱلَّذِينَ ظَلَمُوا۟ بِعَذَابٍۭ بَـِٔيسٍۭ بِمَا كَانُوا۟ يَفْسُقُونَ

And when they [i.e., those advised] forgot that by which they had been reminded, We saved those who had forbidden evil and seized those who wronged, with a wretched punishment, because they were defiantly disobeying.

إِلَّا تَنفِرُوا۟ يُعَذِّبْكُمْ عَذَابًا أَلِيمًا وَيَسْتَبْدِلْ قَوْمًا غَيْرَكُمْ وَلَا تَضُرُّوهُ شَيْـًٔا ۗ وَٱللَّهُ عَلَىٰ كُلِّ شَىْءٍ قَدِيرٌ

If you do not go forth, He will punish you with a painful punishment and will replace you with another people, and you will not harm Him at all. And Allāh is over all things competent.

بَلْ قُلُوبُهُمْ فِى غَمْرَةٍ مِّنْ هَـٰذَا وَلَهُمْ أَعْمَـٰلٌ مِّن دُونِ ذَٰلِكَ هُمْ لَهَا عَـٰمِلُونَ

But their hearts are covered with confusion over this, and they have [evil] deeds besides that [i.e., disbelief] which they are doing,

يَقُولُ يَـٰلَيْتَنِى قَدَّمْتُ لِحَيَاتِى

He will say, "Oh, I wish I had sent ahead [some good] for my life."

ثُمَّ لَتَرَوُنَّهَا عَيْنَ ٱلْيَقِينِ

Then you will surely see it with the eye of certainty.