Chapter 25, Verse 11, The Standard
سورة الفرقان
بَلۡ كَذَّبُواْ بِٱلسَّاعَةِۖ وَأَعۡتَدۡنَا لِمَن كَذَّبَ بِٱلسَّاعَةِ سَعِيرًا
Nay, they deny the hour (the Day of Resurrection), and for those who deny the hour, We have prepared a flaming Fire (i.e. Hell).
Chapter 33, Verse 63, The Coalition
سورة الأحزاب
يَسۡـَٔلُكَ ٱلنَّاسُ عَنِ ٱلسَّاعَةِۖ قُلۡ إِنَّمَا عِلۡمُهَا عِندَ ٱللَّهِۚ وَمَا يُدۡرِيكَ لَعَلَّ ٱلسَّاعَةَ تَكُونُ قَرِيبًا
People ask you concerning the hour, say: "The knowledge of it is with Allah only. What do you know? It may be that the hour is near!"
Chapter 54, Verse 46, The Moon
سورة القمر
بَلِ ٱلسَّاعَةُ مَوۡعِدُهُمۡ وَٱلسَّاعَةُ أَدۡهَىٰ وَأَمَرُّ
Nay, but the hour is their appointed time (for their full recompense), and the hour will be more grievous and more bitter.
Chapter 101, Verse 2, The Calamity
سورة القارعة
مَا ٱلۡقَارِعَةُ
What is the striking (hour)?
Chapter 101, Verse 3, The Calamity
سورة القارعة
وَمَآ أَدۡرَىٰكَ مَا ٱلۡقَارِعَةُ
And what will make you know what the striking (hour) is?