Surah Az-Zumar, ayah 56

أَن تَقُولَ نَفۡسٞ يَٰحَسۡرَتَىٰ عَلَىٰ مَا فَرَّطتُ فِي جَنۢبِ ٱللَّهِ وَإِن كُنتُ لَمِنَ ٱلسَّٰخِرِينَ ٥٦

An taqūla nafsun yāhasratā 'alā mā farrattu fī jambillāhi wa in kuntu laminas-sākhirīn

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."