Following are a number of back-translations as well as a sample translation for translators of Proverbs 26:7:

• Kupsabiny: “If/When a foolish person has used a proverb,
  it is like a lame person has stood up to walk.” (Source: Kupsabiny Back Translation)
• Newari: “For a fool to tell a proverb
  is like a cripple trying to run.” (Source: Newari Back Translation)
• Hiligaynon: “A proverb which the fool-ones are-saying has no value like a foot of a lame man.” (Source: Hiligaynon Back Translation)
• Kankanaey: “The advice of a foolish-person is like a leg that is lame that hangs-limply.” (Source: Kankanaey Back Translation)
• English: “A lame man cannot use his legs,
  and similarly it is useless for a foolish person to speak proverbs/wise sayings.” (Source: Translation for Translators)