Following are a number of back-translations as well as a sample translation for translators of Proverbs 11:21:

• Kupsabiny: “The truth is that, sinners will never go unpunished,
  but nothing shall be done to the righteous.” (Source: Kupsabiny Back Translation)
• Newari: “The wicked
  will surely have to receive punishment,
  but the righteous will have deliverance.
  This is how it happens.” (Source: Newari Back Translation)
• Hiligaynon: “Surely the wicked will-be-punished, but the righteous on-the-other-hand will-not (be-punished).” (Source: Hiligaynon Back Translation)
• Kankanaey: “Those who are doing evil will for-sure be-punished, but the righteous/just, they will-escape/be-rescued.” (Source: Kankanaey Back Translation)
• English: “It is certain that Yahweh will punish evil people
  and that righteous people will escape from being punished.” (Source: Translation for Translators)