Joel 3:1-3
In those days the Lord will restore the fortunes of Judah and gather all nations to the Valley of Jehoshaphat to enter into judgment with them over what they have done to His people and His land.
1 “For, behold, in those days, and in that time, when I restore the fortunes of Judah and Jerusalem,
2 I will gather all nations, and will bring them down into the valley of Jehoshaphat; and I will execute judgment on them there for my people, and for my heritage, Israel, whom they have scattered among the nations. They have divided my land,
3 and have cast lots for my people, and have given a boy for a prostitute, and sold a girl for wine, that they may drink.
In those days the LORD will restore the fortunes of Judah and gather all nations to the Valley of Jehoshaphat to enter into judgment with them over what they have done to his people and his land.
To announce that the LORD will restore the fortunes of Judah and Jerusalem and gather all nations to the Valley of Jehoshaphat to enter into judgment with them — because they scattered his people, divided his land, and sold boys and girls as property.
This unit opens chapter 3's international day-of-the-LORD oracle, expanding the horizon from Judah (chapters 1-2) to all nations. The specific crimes enumerated (scattering, dividing the land, trafficking) ground the judgment in moral-historical terms before the specific indictment of Tyre, Sidon, and Philistia in 3:4-8.
The LORD Judges the Nations and Dwells with His People
The day of the LORD will judge the nations, vindicate God's people, cleanse covenant wrongs, and establish the LORD's holy presence among his restored people.