Following are a number of back-translations as well as a sample translation for translators of Proverbs 26:21:

• Kupsabiny: “A chatterbox stirs up strife,
  like how a log of wood can add heat to a fire.” (Source: Kupsabiny Back Translation)
• Newari: “Like charcoal for burning embers,
  like wood for fire,
  a quarrelsome person [kindles] disputes.” (Source: Newari Back Translation)
• Hiligaynon: “As a charcoal causes-to-make-a-live-coal, and a firewood causes-to-light a fire, a quarrelsome (man) can-starts-up trouble.” (Source: Hiligaynon Back Translation)
• Kankanaey: “Like the way coals and wood cause- fire -to-burn is the way a quarrelsome-person causes- quarreling -to-become-strong.” (Source: Kankanaey Back Translation)
• English: “Putting charcoal on burning coals or putting wood on a fire causes the fire to keep burning;
  similarly, people who like to quarrel cause people to keep arguing.” (Source: Translation for Translators)