Following are a number of back-translations as well as a sample translation for translators of Jeremiah 17:15:

• Kupsabiny: “These people are asking me,
  ‘Where is that which God said he would send against (us)?
  Let that event now take place.’” (Source: Kupsabiny Back Translation)
• Hiligaynon: “The people say to me, ‘Where is now that the LORD is-saying? Why is it not happening yet?’” (Source: Hiligaynon Back Translation)
• English: “People often ridicule me and say,
  ‘You tell us messages that you say came from Yahweh,
  but why have the things that you predicted not happened?/those predictions have not come true!’” (Source: Translation for Translators)