Quran 7:187 from Surah Al-A'raaf on Divine Marvels.
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
English translation: They ask you about the Hour when will be its appointed time Say Only its knowledge (is) with my Lord no (one) can reveal [it] its time except Him It lays heavily in the heavens and the earth Not will it come to you but suddenly They ask you as if you (were) well informed about it Say Only its knowledge (is) with Allah but most (of) the people (do) not know
Transliteration: yasalunaka ani al-sa'ati ayyana mur'saha qul innama il'muha inda rabbi la yujalliha liwaqtiha illa huwa thaqulat fi al-samawati wal-ardi la tatikum illa baghtatan yasalunaka ka-annaka hafiyyun anha qul innama il'muha inda al-lahi walakinna akthara al-nasi la ya'lamuna