What does Isaiah 23:18 mean?
The final verse of Isaiah's oracle from the Lord against Tyre ends on a surprising and positive note. The city will be redeemed in the end. More specifically, the wealth of the city will be redeemed.The oracle against Egypt ended with a description of true redemption in the far future, likely during the reign of the Messiah on earth (Isaiah 19:16–25). The positive note in this verse regarding Tyre's wealth shows that the Lord has a plan. He will use the merchandise and wages produced by the prostitution of Tyre for the good of God's people. It won't just be hoarded away, but rather used for those who "dwell before the Lord."
Commentators suggest options for what this could mean for Tyre. Since Deuteronomy 23:18 forbids the wages of a prostitute from being given to the Lord, perhaps Tyre will be redeemed from her role as a prostitute and be transformed into a people that truly serves the Lord. Another possibility is that the city will once again be destroyed by the Lord and her wealth transferred to His own people in Israel.
In either interpretation, the Lord communicates through Isaiah that He will make use of Tyre's wealth to meet the needs of HIs own people Israel. The larger message to Judah is that they must not prostitute themselves to other nations attempting to protect themselves or provide for their own needs. Instead, the people of Judah must trust in the Lord and wait for Him to provide for them. This, even if provision comes through the prosperity of others.