Surah Al-Mursalat, verse 13

وَإِذَا ٱلرُّسُلُ أُقِّتَتْ ﴿١١﴾

And when the messengers' time has come...

لِأَىِّ يَوْمٍ أُجِّلَتْ ﴿١٢﴾

For what Day was it postponed?

وَمَآ أَدْرَىٰكَ مَا يَوْمُ ٱلْفَصْلِ ﴿١٤﴾

And what can make you know what is the Day of Judgement?

وَيْلٌۭ يَوْمَئِذٍۢ لِّلْمُكَذِّبِينَ ﴿١٥﴾

Woe, that Day, to the deniers.