Following are a number of back-translations as well as a sample translation for translators of Isaiah 50:11:

• Kupsabiny: “Please, all you who use the light from torches
  so that you can attack other people
  You may walk by the light of torches,
  but you shall be punished yourselves.” (Source: Kupsabiny Back Translation)
• Newari: “But now, all you who kindle a fire for yourselves
  and take a burning torch of wheat straw, you go!
  Go walking in the light of your own fire
  and the torch of wheat straw that you kindled.
  You will get to take this matter from my hand,
  you will have to bear great trouble and sorrow.” (Source: Newari Back Translation)
• Hiligaynon: “But watch-out/[lit. be-prepared] you (plur.) who scheme to destroy others; you (plur.) will-be-destroyed by your (plur.) own scheming! The LORD himself will-be- the -one-to-punish you (plur.); you (plur.) will-die in severe punishment.” (Source: Hiligaynon Back Translation)
• English: “But you people who oppose me,
  who would like to throw me into a blazing fire,
  walk in your own fires
  and burn yourselves with your own torches!
  This is what Yahweh will cause to happen to you:
  You will be enduring great torment when you die !” (Source: Translation for Translators)