This continues the prophecy about the people of Moab. God describes events that will happen in the future as if it is happening in the present ([Isaiah 15:1-2](../15/01.md)).
The words "Moab's" and "his" refer to the people of Moab. Alternate translation: "We have heard that the people of Moab are proud and arrogant, boastful and angry" (See: [[rc://en/ta/man/translate/figs-metonymy]])