Surah Maryam, ayah 39

وَأَنذِرۡهُمۡ يَوۡمَ ٱلۡحَسۡرَةِ إِذۡ قُضِيَ ٱلۡأَمۡرُ وَهُمۡ فِي غَفۡلَةٖ وَهُمۡ لَا يُؤۡمِنُونَ ٣٩

Wa andhirhum yawmal-hasrati idh qudiyal-amru wahum fī ghaflatin wahum lā yu'minūn

And warn them, [O Muḥammad], of the Day of Regret, when the matter will be concluded;⁸¹⁴ and [yet], they are in [a state of] heedlessness, and they do not believe.