Joel 3:17-21--The Glorious Future of Judah

Joel 3:17-21
English Standard Version

The Glorious Future of Judah
17 “So you shall know that I am the LORD your God,
    who dwells in Zion, my holy mountain.
And Jerusalem shall be holy,
    and strangers shall never again pass through it.

18 “And in that day
the mountains shall drip sweet wine,
    and the hills shall flow with milk,
and all the streambeds of Judah
    shall flow with water;
and a fountain shall come forth from the house of the LORD
    and water the Valley of Shittim.

19 “Egypt shall become a desolation
    and Edom a desolate wilderness,
for the violence done to the people of Judah,
    because they have shed innocent blood in their land.
20 But Judah shall be inhabited forever,
    and Jerusalem to all generations.
21 I will avenge their blood,
    blood I have not avenged,
    for the LORD dwells in Zion.”

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The book of Joel ends with a promise of a glorious future for the LORD's people.  The LORD will return to His holy mountain (Mount Zion), to Jerusalem, The City of the Great King.  Jerusalem will once again be called The Holy City, and there will never again be strangers (those who are not the people of God) who enter it.  This leads me to think we're talking about The New Jerusalem with The New Heavens and New Earth, as all the enemies of God have been destroyed.

The Land will be extremely fruitful so that even the mountains will drip with sweet wine, the hills will flow with milk and all the streambeds of Judah will be filled with living water.  The source of this living water will be from the Temple of the LORD (see Ezekiel).

The once powerful nations that have been a thorn in Jacob's side will be destroyed--Egypt and Edom will never again vex them.  The LORD's people will live in the Promised land throughout all generations, and He will avenge the innocent blood of His people that was shed by Egypt, Edom, and all the other enemies of His people.  By this, all people will know that the LORD lives in Zion and He delivers, saves, and avenges His people--the people that He has chosen to love and call by His Name.