7:187
يَسْـَٔلُ ونَ كَ عَنِ ٱل سَّاعَةِ أَيَّانَ مُرْسَىٰ هَا قُلْ إِنَّ مَا عِلْمُ هَا عِندَ رَبِّ ى لَا يُجَلِّي هَا لِ وَقْتِ هَآ إِلَّا هُوَ ثَقُلَتْ فِى ٱل سَّمَٰوَٰتِ وَ ٱلْ أَرْضِ لَا تَأْتِي كُمْ إِلَّا بَغْتَةً يَسْـَٔلُ ونَ كَ كَأَنَّ كَ حَفِىٌّ عَنْ هَا قُلْ إِنَّ مَا عِلْمُ هَا عِندَ ٱللَّهِ وَ لَٰكِنَّ أَكْثَرَ ٱل نَّاسِ لَا يَعْلَمُ ونَ
They ask you, [O Muhammad], about the Hour: when is its arrival? Say, "Its knowledge is only with my Lord. None will reveal its time except Him. It lays heavily upon the heavens and the earth. It will not come upon you except unexpectedly." They ask you as if you are familiar with it. Say, "Its knowledge is only with Allah, but most of the people do not know."
91:3
وَ ٱل نَّهَارِ إِذَا جَلَّىٰ هَا
And [by] the day when it displays it