General Information:

In verses 16-21, Yahweh speaks through Obadiah to tell the people of Judah that they will possess the land of Edom.

Those from the Negev will possess the mount of Esau

"The Israelites in the Negev will take the land of the Edomites"

This refers to Israelites in the western foothills of Israel who will capture the land of the Philistines in battle.

Here "They" appears to refer to the people of Israel in general.

"the tribe of Benjamin will possess" or "the descendants of Benjamin will possess"