Following are a number of back-translations as well as a sample translation for translators of Isaiah 1:21:

• Kupsabiny: “Oh, Jerusalem, this/you city who had faith before!
  What was wrong with you so that you went from place to place (like a prostitute)?
  Before you had people who followed truth and righteousness,
  but now you have murderers.” (Source: Kupsabiny Back Translation)
• Newari: “Look, how the faithful city
  has now become like a prostitute!
  The city which used to be full of
  righteousness and justice
  is now full of
  those who are murderers.” (Source: Newari Back Translation)
• Hiligaynon: “[You (plur.)] look-at the city of Jerusalem. In time-past (was) faithful, but now (she is) now like a woman who sells her body. In time-past righteous people live there, but now murderers (live there).” (Source: Hiligaynon Back Translation)