Following are a number of back-translations as well as a sample translation for translators of Ezekiel 21:9:

• Kupsabiny: “‘Ezekiel, prophesy. Tell the people that,
  ‘God is saying:
  The sword is sharpened, oh, please
  and it is polished/washed.” (Source: Kupsabiny Back Translation)
• Hiligaynon: “‘Man, speak my message to the people. Tell them that I, the Lord, say: I sharpened my sword for killing you (plur.). I polished it well so-that will-flash like the lightning. So/Well will- you (plur.) still -rejoice? Will- you still -mock my disciplining of you (plur.)?” (Source: Hiligaynon Back Translation)
• English: “‘You human, prophesy and say to them, ‘This is what Yahweh says:
  I have sharpened my sword
  and polished it.” (Source: Translation for Translators)