כִּ֣י כֹ֤ה אָמַר֙ יְהוָ֣ה צְבָא֔וֹת כִּרְת֣וּ עֵצָ֔ה וְשִׁפְכ֥וּ עַל־יְרוּשָׁלִַ֖ם סֹלְלָ֑ה הִ֚יא הָעִ֣יר הָפְקַ֔ד כֻּלָּ֖הּ עֹ֥שֶׁק בְּקִרְבָּֽהּ׃
For thus hath the LORD of hosts said: Hew ye down her trees, And cast up a mound against Jerusalem; This is the city to be punished; Everywhere there is oppression in the midst of her.
Read kabbalistic (mystical) interpretation of Jeremiah 6:6: and classical mystical sources.