Qur'an 39:56 · Az-Zumar

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

(56) Lest a soul should say,[1355] "Oh, [how great is] my regret over what I neglected in regard to Allāh and that I was among the mockers."