39:56
أَنتَقُولَنَفْسٌيَٰحَسْرَتَىٰعَلَىٰمَافَرَّطتُفِىجَنۢبِٱللَّهِوَإِنكُنتُلَمِنَٱلسَّٰخِرِينَ٥٦
an taqūla nafsun yāḥasratā ʿalā mā farraṭtu fī janbi l-lahi wa-in kuntu lamina l-sākhirīna
Lest a soul should say, "Oh, [how great is] my regret over what I neglected in regard to Allāh and that I was among the mockers."(56)