Following are a number of back-translations as well as a sample translation for translators of Amos 1:8:

• Kupsabiny: “I shall destroy the people of Ashdod
  together with the king of Ashkelon.
  I shall punish the city of Ekron
  and the remnant of the Philistines shall die.’” (Source: Kupsabiny Back Translation)
• Newari: “I will destroy the King of Ashdod
  and the ruler of Ashkelon completely.
  I will turn my hand against Ekron
  and all the remaining Philistines will die,’
  says the Sovereign LORD.” (Source: Newari Back Translation)
• Hiligaynon: “I will-destroy the leaders/[lit. heads] of Ashdod and of Ashkelon, and I will-punish those who-come-from-Ekron. The Filistinhon who are-able-to-flee from the punishment will- also -die. I, the Lord GOD, (am) the-(one) saying this.’” (Source: Hiligaynon Back Translation)
• English: “I will get rid of the king of Ashdod city
  and the king who rules in Ashkelon city.
  I will also strike/punish the people of Ekron city,
  and all the people of Philistia who are still alive will be killed.’” (Source: Translation for Translators)