'Cities of the Levites' in the Bible

As to the cities of the Levites, the houses of the cities of their possession, the Levites shall have a never-ending redemption.

And if a man purchases a house from the Levites, then the house that was sold and the city of his possession shall go out in the year of jubilee. For the houses of the cities of the Levites are their possession among the sons of Israel.

All the cities of the Levites within the possession of the sons of Israel were forty-eight cities and their open lands.