Jamieson, Fausset and Brown on Micah 1:15

15. Yet will I bring an heir unto thee--rather, "the heir." As thou art now occupied by possessors who expelled the former inhabitants, so will I bring "yet" again the new possessor, namely, the Assyrian foe. Other heirs will supplant us in every inheritance but that of heaven. There is a play upon the meaning of Mareshah, "an inheritance": there shall come the new heir of the inheritance.

Adullam the glory of Israel--so called as being superior in situation; when it and the neighboring cities fell, Israel's glory was gone. Maurer, as the Margin, translates, "the glory of Israel" (her chief citizens: answering to "thy delicate children," Mi 1:16) "shall come in flight to Adullam." English Version better preserves the parallelism, "the heir" in the first clause answering to "he" in the second.