Following are a number of back-translations as well as a sample translation for translators of Isaiah 43:9:

• Kupsabiny: “Let the nations gather themselves
  and let all people come to one place.
  Which one among their idols
  is there who has foretold what is happening like this time now?
  Let them go/come with witnesses
  so that they can witness/testify that their words have come true.” (Source: Kupsabiny Back Translation)
• Newari: “All the nations gathered together in one place,
  all the peoples of the world gathered in one place.
  Which among their gods can tell us about future,
  and who can declare what happened before [it happened]?
  Let them bring their witnesses to prove they were right,
  and having heard others, let them say [lit.: speak like this], "That is the truth."” (Source: Newari Back Translation)
• Hiligaynon: “Let- all the people of the nation -gather as one. Who among their little-gods/false-gods can-prophesy the future? Who among them have-told before the happenings now? Let- them -bring witnesses to prove that they are right so-that other can-hear this and will- say that indeed (it is) really true.” (Source: Hiligaynon Back Translation)