Contrary to popular belief, revenge is not only in the scriptures, but also righteous (2 Thessalonians 1:6). The enslavement of the heathens in the first 1000 years of Israel's Kingdom is justified as payback for all of the wickedness that those nations did to the children of Israel throughout history.
Psalms 137:9
Strongs concordance
Breakdown
And the people
The Israelites. shall take them
The other nations. The Israelites will put the heathens into hardcore slavery for 1,000 years (Revelation 20:5) because of all of the evil they have done to the Israelites. At the end of this period, the heathens will be in tribute to the Israelites, but the Edomites will be completely destroyed (Obadiah 1:18).
Strongs concordance
Strongs concordance
Breakdown
Idumea
The Greek way of saying Edom. The Edomites will be completely destroyed (Obadiah 1) and their land will be given to The Tribe of Judah.
Precepts
Obadiah 1:18Strongs concordance
2 Esdras 15:57