וְהָיָ֤ה בַיּוֹם־הַהוּא֙ נְאֻם־יְהוָ֔ה יֹאבַ֥ד לֵב־הַמֶּ֖לֶךְ וְלֵ֣ב הַשָּׂרִ֑ים וְנָשַׁ֙מּוּ֙ הַכֹּ֣הֲנִ֔ים וְהַנְּבִיאִ֖ים יִתְמָֽהוּ׃
And it shall come to pass at that day, Saith the LORD, That the heart of the king shall fail, And the heart of the princes; And the priests shall be astonished, And the prophets shall wonder.
Read halakhic rulings (Jewish law) on Jeremiah 4:9: and classical halakhic sources.