en_tn_condensed/isa/16/13.md

This is the word

"This is the message." This refers to all he said in 15:1-16:12.

concerning Moab

This refers to "concerning the people of Moab." (See: rc://en/ta/man/translate/figs-metonymy)

the glory of Moab will disappear

"the land of Moab will be worth nothing"