Surah Al-Araf, verse 187

يَسْـَٔلُونَكَ عَنِ ٱلسَّاعَةِ أَيَّانَ مُرْسَىٰهَا ۖ قُلْ إِنَّمَا عِلْمُهَا عِندَ رَبِّى ۖ لَا يُجَلِّيهَا لِوَقْتِهَآ إِلَّا هُوَ ۚ ثَقُلَتْ فِى ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ ۚ لَا تَأْتِيكُمْ إِلَّا بَغْتَةً ۗ يَسْـَٔلُونَكَ كَأَنَّكَ حَفِىٌّ عَنْهَا ۖ قُلْ إِنَّمَا عِلْمُهَا عِندَ ٱللَّهِ وَلَـٰكِنَّ أَكْثَرَ ٱلنَّاسِ لَا يَعْلَمُونَ ﴿١٨٧﴾

7:187 They ask you [O Prophet] about the Hour, “When will it come to pass?” Say, “Its knowledge is only with my Lord. None can reveal its due time except Him. It will be heavy on the heavens and earth; it will only come to you by surprise.” They ask you as if you are well-aware of it. Say, “Its knowledge is only with Allah, but most people do not know.”