سورة Al-A'raf (The Heights ) - الآية 187

They ask you about the Resurrection, as to when it is destined; say, “Indeed its knowledge is with my Lord; only He will manifest it at its time; it is proving cumbersome in the heavens and the earth; it will not come to you except suddenly”; they question you as if you have researched it deeply; say, “Indeed its knowledge is with Allah only but most people do not know.”