Joshua 15:42

Libnah, Ether, Ashan,

Joshua and all Israel marched from Makkedah to Libnah and fought against it.

the king of Libnah (one), the king of Adullam (one),

Ain, Rimmon, Ether, and Ashan -- a total of four cities and their towns,

So Edom has remained free from Judah's control to this very day. At that same time Libnah also rebelled.

Treasury of Scripture Knowledge

Libnah, and Ether, and Ashan,

Ain, Rimmon, Ether, and Ashan -- a total of four cities and their towns,