Following are a number of back-translations as well as a sample translation for translators of Isaiah 30:9:

• Kupsabiny: “These people are oh so rebellious,
  and children who cannot be trusted.
  Children who do not listen to the word
  that God is saying to them.” (Source: Kupsabiny Back Translation)
• Newari: “These are people of a stubborn nation, they are sons and daughters of deceivers [lit.: ones who give deception],
  or they are sons and daughters of ones who do not obey the instructions of the LORD.” (Source: Newari Back Translation)
• Hiligaynon: “For they are rebellious, liars, and they do not want to listen to what I am teaching.” (Source: Hiligaynon Back Translation)