אִ֣ם ׀ רָחַ֣ץ אֲדֹנָ֗י אֵ֚ת צֹאַ֣ת בְּנוֹת־צִיּ֔וֹן וְאֶת־דְּמֵ֥י יְרוּשָׁלִַ֖ם יָדִ֣יחַ מִקִּרְבָּ֑הּ בְּר֥וּחַ מִשְׁפָּ֖ט וּבְר֥וּחַ בָּעֵֽר׃
when the Lord shall have washed away the filth of the daughters of Zion, and shall have purged the blood of Jerusalem from the midst thereof, by the spirit of judgment, and by the spirit of destruction.
Read kabbalistic (mystical) interpretation of Isaiah 4:4: and classical mystical sources.