Sura al-Aʿrāf 7:187

يَسْـَٔلُونَكَ عَنِ ٱلسَّاعَةِ أَيَّانَ مُرْسَىٰهَا قُلْ إِنَّمَا عِلْمُهَا عِندَ رَبِّى لَا يُجَلِّيهَا لِوَقْتِهَآ إِلَّا هُوَ ثَقُلَتْ فِى ٱلسَّمَٰوَٰتِ وَٱلْأَرْضِ لَا تَأْتِيكُمْ إِلَّا بَغْتَةً يَسْـَٔلُونَكَ كَأَنَّكَ حَفِىٌّ عَنْهَا قُلْ إِنَّمَا عِلْمُهَا عِندَ ٱللَّـهِ وَلَٰكِنَّ أَكْثَرَ ٱلنَّاسِ لَا يَعْلَمُونَ

yasʾalūnaka ʿani l-sāʿati ayyāna mursahā qul innamā ʿilmuhā ʿinda rabbī lā yujallīhā li-waqtihā illā huwa thaqulat fī l-samāwāti wa-l-arḍi lā taʾtīkum illā baghtatan yasʾalūnaka ka-annaka ḥafiyyun ʿanhā qul innamā ʿilmuhā ʿinda allāhi wa-lākinna akthara l-nāsi lā yaʿlamūna

They ask thee about the (final) Hour - when will be its appointed time? Say: "The knowledge thereof is with my Lord (alone): None but He can reveal as to when it will occur. Heavy were its burden through the heavens and the earth. Only, all of a sudden will it come to you." They ask thee as if thou Wert eager in search thereof: Say: "The knowledge thereof is with Allah (alone), but most men know not."