Following are a number of back-translations as well as a sample translation for translators of Isaiah 1:20:

• Kupsabiny: “But if you refuse and disobey,
  a spear will eat you.’” (Source: Kupsabiny Back Translation)
• Newari: “But if you rebel against me
  and do not obey,
  you will be slaughtered by the sword.
  The LORD has spoken."” (Source: Newari Back Translation)
• Hiligaynon: “But if you (plur.) will-disobey and will-rebel, surely you (plur.) will-die. This indeed will-happen, for I, the LORD, (am) the-(one) saying this.’” (Source: Hiligaynon Back Translation)
• English: “But, if you turn away from me and rebel against me,
  you will be killed by your enemies’ swords.
  That will surely happen, because I, Yahweh, have said it.’” (Source: Translation for Translators)