Following are a number of back-translations as well as a sample translation for translators of Isaiah 28:26:

• Kupsabiny: “The farmer knows what he is doing
  because God is teaching him what is right/true.” (Source: Kupsabiny Back Translation)
• Newari: “His God has taught
  him the right information.” (Source: Newari Back Translation)
• Hiligaynon: “He knew what is right to do for God is-teaching him.” (Source: Hiligaynon Back Translation)
• English: “He does that because God has taught him the correct way to do it.” (Source: Translation for Translators)