When I have brought them again from the people, and gathered them out of their enemies’ lands, and am sanctified in them in the sight of many nations;
The heathen mistook Israel's ruin for proof that God could not keep His covenant; but when He restores His people after their reformation, all the world will see the truth: Israel fell not by God's weakness but by their own sin, which forfeited His favour and threw them into His enemies' hands. This turns their reproach into His glory.
AI summary
Commenting on Ezekiel 39:23-29
When God gathers them from among the nations and brings them home from their enemies' lands, His holiness will be visible to all. Their public repentance, their turning from sin to seek God and embrace the Messiah, will display that He has been righteous and holy in every dealing with them.
AI summary
sanctified in them--vindicated as holy in My dealings with them.