Following are a number of back-translations as well as a sample translation for translators of Ecclesiastes 10:9:

• Kupsabiny: “When/If a person crushes stones, the stone might crash on him, and the one who splits firewood, that firewood may pierce/stab him.” (Source: Kupsabiny Back Translation)
• Newari: “The one who quarries rock may incur an injury,
  and the one who chops wood may receive an injury from the wood.” (Source: Newari Back Translation)
• Hiligaynon: “If you (sing.) dig-up a rock/stone or chop wood, you (sing.) might be-wounded.” (Source: Hiligaynon Back Translation)
• English: “If you work in a quarry,
  it is possible that a stone will fall on you and injure you.
  It is possible that men who split logs
  will be injured by one of those logs.” (Source: Translation for Translators)