What does Obadiah 1:21 mean?
This verse is an explicit reference to the millennial kingdom of the end times. Mount Zion is a metaphor for the city of Jerusalem, much as one might say "The White House" as a reference to the city of Washington, D.C. in the United States. In the end times, Israel will be restored to her Promised Land. Part of that restoration will be rulership over the lands which once belonged to the Edomites. Verse 18 seems to suggest that there will not be any descendants of Esau left at that time.This is an example of Old Testament prophets looking forward, and seeing the future both in the near-term, and the long-term. Obadiah's predictions about the destruction of Edom were fulfilled not long after these words were written. The eventual restoration of Israel, and the rule of the Lord (Zechariah 14:9), will not occur until the very end. As with all instances of God's judgment, the end goal is restoration and reconciliation, not merely revenge.