Following are a number of back-translations as well as a sample translation for translators of Jeremiah 16:21:

• Kupsabiny: “God said to me,
  ‘I shall show these my people
  my strength and my authority.
  Then, they shall know/realize
  that I am God.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “The LORD said, ‘So now I will-show to them my power and ability so-that they will-know that I am the LORD.’” (Source: Hiligaynon Back Translation)