Numbers 35:6

‘As for cities of the Levites, the Levites have a permanent right of redemption for the houses of the cities which are their possession.

Then Moses set apart three cities across the Jordan to the east toward the sunrise,

“Speak to the sons of Israel, saying, ‘Designate the cities of refuge, of which I spoke to you by the hand of Moses,

Then the heads of households of the Levites came near to Eleazar the priest and to Joshua the son of Nun and to the heads of households of the tribes of the sons of Israel.

So the sons of Israel gave to the Levites the cities with their pasture lands.

Cities of Refuge