Following are a number of back-translations as well as a sample translation for translators of Jeremiah 9:3:

• Kupsabiny: “God said/says,
  ‘Their tongues throw/spit out lies
  like bows that shoot arrows.
  (They) live with lying in the land
  and continue to do this and that evil.
  Those people do not follow what I am saying.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “The LORD said, ‘They are always ready to lie like a bow-and-arrow ready to shoot. Lies supersede in this land and not (the) truth. Their sinning is-extremely-becoming-worse, and they do not acknowledge me.” (Source: Hiligaynon Back Translation)
• English: “Yahweh replied to me,
  ‘They use their tongues to tell lies
  like people shoot arrows with bows.
  It is because they tell lies that they have become more powerful in this land,
  and they do not know me.” (Source: Translation for Translators)