Albert Barnes Commentary Obadiah 1:20

"And the captives of this host of the children of Israel, that are [among] the Canaanites, [shall possess] even unto Zarephath; and the captives of Jerusalem, that are in Sepharad, shall possess the cities of the South." — Obadiah 1:20 (ASV)

And the captivity of this host of the children of Israel -, (it must, I believe, be rendered,) “which are among the Canaanites, as far as Zarephath, and the captivity of Jerusalem which is in Sepharad, shall possess the cities of the South.” Obadiah had described how the two tribes, to whom the promises to the house of David belonged, should spread out on all sides. Here he represents how Judah should, in its turn, receive back those now carried away from them, so that all would again be one fold.

Zarephath - (probably “smelting-house,” and thus a place of slave-labor, pronounced Sarepta in Luke (Luke 4:26)) belonged to Sidon (1 Kings 17:9), lying on the sea about halfway between it and Tyre. These were then, probably, captives, placed by Tyrians for the time being in safe keeping in the narrow plain between Lebanon and the sea, intercepted by Tyre itself from their home, and waiting to be transported to a more distant slavery. These, with those already sold to the Grecians and in slavery at Sardis, formed one whole. They stand as representatives of all who, whatever their lot, had been torn away from the Lord’s land and had been outwardly severed from His heritage.