Az Zumar, 56 Ayah
39:56
أَن تَقُولَ نَفۡسٞ يَٰحَسۡرَتَىٰ عَلَىٰ مَا فَرَّطتُ فِي جَنۢبِ ٱللَّهِ وَإِن كُنتُ لَمِنَ ٱلسَّٰخِرِينَ ٥٦
'An Taqūla Nafsun Yā Ĥasratā `Alá Mā Farraţtu Fī Janbi Al-Lahi Wa 'In Kuntu Lamina As-Sākhirīna
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."