Following are a number of back-translations as well as a sample translation for translators of Isaiah 58:6:

• Kupsabiny: “I want you to fast in this way:
  Release people who are tied/imprisoned since they are innocent
  and release those people
  that you oppressed.
  Remove everything
  that makes other people suffer for nothing.” (Source: Kupsabiny Back Translation)
• Newari: “To set free those who have been confined because of injustice,
  and to set free those who have been oppressed,
  to break all yokes,
  is not this the fast I have chosen? ” (Source: Newari Back Translation)
• Hiligaynon: “The kind of fasting that I want is the fasting that accompanied-with these righteous ways: You (plur.) stop the oppression and taking-into-prison of the innocents, and you (plur.) set-free the ones being-oppressed.” (Source: Hiligaynon Back Translation)
• English: “No, that is not the kind of fasting that I desire.
  What I really want is for you to free those who have been unjustly put in prison ,
  and to encourage those who are treated cruelly/oppressed;
  I want you to free those who have been oppressed in any way.” (Source: Translation for Translators)