Surah Az-Zumar (الزمر) Ayah 56 - Tafsir | TafsirHub

أَن تَقُولَ نَفْسٌۭ يَٰحَسْرَتَىٰ عَلَىٰ مَا فَرَّطتُ فِى جَنۢبِ ٱللَّهِ وَإِن كُنتُ لَمِنَ ٱلسَّٰخِرِينَ

"Lest a soul should say, "Oh [how great is] my regret over what I neglected in regard to Allah and that I was among the mockers.""