Following are a number of back-translations as well as a sample translation for translators of Deuteronomy 32:20:

• Kupsabiny: “He said, ‘I am turning my back to them
  so that they can later suffer the consequences.
  These people have gone much astray
  so that they cannot be trusted at all.” (Source: Kupsabiny Back Translation)
• Newari: “He said, "I will abandon them,
  and watch, what will happen to them.
  They are a crooked people,
  and untrustworthy children.” (Source: Newari Back Translation)
• Hiligaynon: “He said, ‘I will-turn-back from them, and I will-see what will-be- their -destined-to,
  for they are wicked generation, unfaithful children.” (Source: Hiligaynon Back Translation)
• English: “He said, ‘They are very wicked/stubborn people,
  very unfaithful;
  so I will no longer help them,
  and then I will watch and see what happens to them.” (Source: Translation for Translators)