أَنْ تَقُولَ نَفْسٌ يَا حَسْرَتَا عَلَىٰ مَا فَرَّطْتُ فِي جَنْبِ اللَّهِ وَإِنْ كُنْتُ لَمِنَ السَّاخِرِينَ

Surah Az-Zumar : 56
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."

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