Following are a number of back-translations as well as a sample translation for translators of Jeremiah 5:15:

• Kupsabiny: “People of Israel,
  I will send a community that comes from far to raid you,
  a community that are experts in war,
  people of another language,
  people whose words you do not understand.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “The LORD said, ‘People of Israel, I will-send men from a distant nation to attack you (plur.). This a very old/ancient nation, that their language you (plur.) can- not -understand.” (Source: Hiligaynon Back Translation)
• English: “Listen to this, you people of Israel:
  I will bring the army of a distant nation to attack you.
  It is a very powerful nation that has existed for a long time.
  They speak a language that you do not know
  and which you will not be able to understand.” (Source: Translation for Translators)