Zion shall be redeemed with judgment, and her converts with righteousness.
Zion shall be redeemed with judgment - temporally, civilly, and morally; type of the spiritual redemption by the price of Jesus Christ's blood (1 Peter 1:18-19), the foundation of "judgment" and "righteousness," and so of pardon.
And her converts with righteousness. The judgment and righteousness are God's first (Isaiah 42:21; Romans 3:26); so they become man's when "converted" (Romans 8:3-4): typified in the display of God's "justice," then exhibited in delivering his covenant people, whereby justice or "righteousness" was produced in them.
Converts - so Maurer. But margin 'they that return of her'-namely, the remnant that return from captivity. However, as Isaiah had not yet expressly foretold the Babylonian captivity, the English version is better.