Following are a number of back-translations as well as a sample translation for translators of Jeremiah 6:27:

• Kupsabiny: “Jeremiah, you are the one who shall do the testing,
  and you shall examine my people carefully.
  Test them so you may see
  how their paths/ways are.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “The LORD said to me, ‘I have-made you (plur.) as-if a tester of metals so-that you (plur.) can test the ways of my people.” (Source: Hiligaynon Back Translation)
• English: “Then Yahweh said to me,
  ‘Jeremiah, I have caused you to become like someone who heats metal very hot to completely burn the impurities.
  You will examine my people’s behavior.” (Source: Translation for Translators)