Following are a number of back-translations as well as a sample translation for translators of Isaiah 28:9:

• Kupsabiny: “There is no one whom God can teach wisdom,
  or (whom) he can even show/explain his message to.
  The leaders are like small children.
  Like children who are still suckling.” (Source: Kupsabiny Back Translation)
• Newari: “Concerning me they will sigh, they will say,
  "Who does he intend to teach?
  Who needs his message?
  Yes, it is only suitable for a recently weaned child.” (Source: Newari Back Translation)
• Hiligaynon: “They are- still -complaining saying, ‘What he thinks of us (incl.), just children newly weaned? Why he is teaching us (incl.) that way?” (Source: Hiligaynon Back Translation)