​Regret

The person with the most intense remorse on the Day of Resurrection will be the man who sold his Hereafter for the world of others.

رسولُ اللَّهِ صلى اللَّه عليه وآله :  إنَّ أشَدَّ النّاسِ نَدامَةً يَومَ القِيامَةِ ، رجُلٌ باعَ آخِرَتَهُ بدُنيا غَيرِهِ . كنز العمّال : 14936 .

 The Prophet (SAWA) said, 'The person with the most intense remorse on the Day of Resurrection will be the man who sold his Hereafter for the world of others.' Kanz al-Ummal, no. 14936