69:50
وَإِنَّهُۥ لَحَسْرَةٌ عَلَى ٱلْكَـٰفِرِينَ
wa-innahu laḥasratun ʿalā l-kāfirīna
And indeed, it will be [a cause of] regret upon the disbelievers.
— Saheeh International
this will be a source of bitter regret for the disbelievers-
— M. A. S. Abdel Haleem
And indeed it (this Qur’ân) will be an anguish for the disbelievers (on the Day of Resurrection).
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali