Joshua 21:39-45 CSB

39 Heshbon with its pasturelands, and Jazer with its pasturelands-four cities in all.
40 All 12 cities were allotted to the clans of Merari's descendants, the remaining Levite clans.
41 Within the Israelite possession there were 48 cities in all with their pasturelands for the Levites.
42 Each of these cities had its own surrounding pasturelands; this was true for all the cities.

The Lord's Promises Fulfilled

43 So the Lord gave Israel all the land He had sworn to give their fathers, and they took possession of it and settled there.

References for Joshua 21:43

      44 The Lord gave them rest on every side according to all He had sworn to their fathers. None of their enemies were able to stand against them, for the Lord handed over all their enemies to them.
      45 None of the good promises the Lord had made to the house of Israel failed. Everything was fulfilled.