הֵילִ֕ילוּ כִּ֥י קָר֖וֹב י֣וֹם יְהוָ֑ה כְּשֹׁ֖ד מִשַּׁדַּ֥י יָבֽוֹא׃
Howl ye; for the day of the LORD is at hand; As destruction from the Almighty shall it come.
Read kabbalistic (mystical) interpretation of Isaiah 13:6: and classical mystical sources.