אֵיכָה֙ הָיְתָ֣ה לְזוֹנָ֔ה קִרְיָ֖ה נֶאֱמָנָ֑ה מְלֵאֲתִ֣י מִשְׁפָּ֗ט צֶ֛דֶק יָלִ֥ין בָּ֖הּ וְעַתָּ֥ה מְרַצְּחִֽים׃
How is the faithful city Become a harlot! She that was full of justice, Righteousness lodged in her, But now murderers.
Read Jewish philosophy on Isaiah 1:21: Rambam's Guide for the Perplexed, Saadia Gaon, and classical Jewish philosophical sources, free online.