Quran 19:39 from Surah Maryam on Divine Marvels.
وَأَنذِرۡهُمۡ يَوۡمَ ٱلۡحَسۡرَةِ إِذۡ قُضِيَ ٱلۡأَمۡرُ وَهُمۡ فِي غَفۡلَةٖ وَهُمۡ لَا يُؤۡمِنُونَ
English translation: And warn them (of the) Day (of) the Regret when has been decided the matter And they (are) in heedlessness and they (do) not believe
Transliteration: wa-andhir'hum yawma al-hasrati idh qudiya al-amru wahum fi ghaflatin wahum la yu'minuna