Following are a number of back-translations as well as a sample translation for translators of Amos 1:3:

• Kupsabiny: “God is saying,
  ‘The people of Damascus sinned repeatedly.
  I will truly punish those people,
  because they caused suffering to the people of Gilead
  and persecuted them severely.” (Source: Kupsabiny Back Translation)
• Newari: “The Lord has said,
  "The people of Damascus have sinned again and again.
  I will surely punish them.
  Because they treated the people of Gilead very badly,
  like grain is threshed with sledges having iron teeth.” (Source: Newari Back Translation)
• Hiligaynon: “This is what- the LORD -says concerning Syria: ‘Because of the continuous sinning of those who-come-from-Damascus, I will- surely/severely -punish them. For they treated-with-great-harshness those who-come-from-Gilead which it-seemed-like had-been-treaded-upon with a board that has something-like-teeth of iron underneath.” (Source: Hiligaynon Back Translation)
• English: “This is also what Yahweh said to me:
  ‘I will punish the people of Damascus, the capital of Syria, because of the many sins that they have committed;
  I will not change my mind about punishing them ,
  because the cruel things that they did to the people of the Gilead region
  were like people threshing grain using sledges that have iron teeth/sharp iron nails in them.” (Source: Translation for Translators)