Joel 3:17
Then you will know that I am the LORD your God,
What it says
God's people will know that He dwells in Zion, making Jerusalem holy and no longer open to profaning strangers.
What it is doing
This verse begins the chapter's final promise with the holiness-producing presence of God.
In context
17Then you will know that I am the LORD your God, 18And in that day the mountains will drip with sweet wine, 19Egypt will become desolate, 20But Judah will be inhabited forever, 21For I will avenge their blood,