For because thou hast trusted in thy works and in thy treasures, thou shalt also be taken: and Chemosh shall go forth into captivity with his priests and his princes together.
Because thou hast trusted in thy works namely, fortifications built by thy work. Moab was famous for its fortresses and "strong holds" (Jeremiah 48:18). The antithesis is to Jeremiah 48:6, "Be ... in the wilderness," where there are no fortified cities.
Thou ... also - like the rest of the surrounding peoples, Judah, etc., "shalt be taken."
Chemosh - the tutelary god of Moab (Numbers 21:29; Judges 11:24; 1 Kings 11:7; 2 Kings 23:13).
Shall go forth into captivity. When a people was vanquished, their gods also were taken away by the victors (Jeremiah 43:12).