Al-A'raf 7:187

يَسۡـَٔلُونَكَ عَنِ ٱلسَّاعَةِ أَيَّانَ مُرۡسَىٰهَاۖ قُلۡ إِنَّمَا عِلۡمُهَا عِندَ رَبِّيۖ لَا يُجَلِّيهَا لِوَقۡتِهَآ إِلَّا هُوَۚ ثَقُلَتۡ فِي ٱلسَّمَٰوَٰتِ وَٱلۡأَرۡضِۚ لَا تَأۡتِيكُمۡ إِلَّا بَغۡتَةٗۗ يَسۡـَٔلُونَكَ كَأَنَّكَ حَفِيٌّ عَنۡهَاۖ قُلۡ إِنَّمَا عِلۡمُهَا عِندَ ٱللَّهِ وَلَٰكِنَّ أَكۡثَرَ ٱلنَّاسِ لَا يَعۡلَمُونَ 187

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