Surah Al-A'raf, ayah 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 ١٨٧

Yas'alūnaka 'anis-sā'ati ayyāna mursāhā qul innamā 'ilmuhā 'inda rabbī lā yujallīhā liwaqtihā illā huwa thaqulat fis-samāwāti wal-ardi lā ta'tīkum illā baghtatan yas'alūnaka ka annaka hafiyyun 'anhā qul innamā 'ilmuhā 'indallāhi walākinna aktharan-nāsi lā ya'lamūn

They ask you, [O Muḥammad], about the Hour: when is its arrival?⁴²⁸ Say, "Its knowledge is only with my Lord. None will reveal its time except Him. It lays heavily⁴²⁹ 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 Allāh, but most of the people do not know."