Therefore shall evil come upon thee; or rather, when it shall come: Heb. the morning of it, the day or time of its approach. And they are justly upbraided and derided for this ignorance, because the astrologers, the star-gazers, and the monthly prognosticators, mentioned here, Isaiah 17:13, pretended punctually to foretell the particular time of all future events. And this explication agrees with the history, Babylon being surprised by Cyrus when they were in deep security, as is manifest, both from Scripture, Jeremiah 51:31 Da 5, and from other histories. Desolation shall come upon thee suddenly; or, when thou shalt not know it. Thou shalt not apprehend thy danger till it be too late.
Related Commentaries of Isaiah 47:11
Isaiah 47:11
11 Therefore shall evil come upon thee; thou shalt not know from whence it riseth: and mischief shall fall upon thee; thou shalt not be able to put it off: and desolation shall come upon thee suddenly, which thou shalt not know.