Out of their inheritance. Out of that of Israel (see note on Joshua 21:1). These cities. The number was forty-eight, i.e; four times twelve. Bahr ('Symbolik des Alten Testaments,' 1:221) remarks on the symbolical meaning of this number.
He compares it, first, to the twelve tribes marching in four detachments, the ark of God and its guard in the centre (see Numbers 2:1-34). Four, he says, is the number of the world, and three the sign of God, and twelve of the combination of the two.
Thus we are reminded of the heavenly city which "lieth four-square," which has "twelve foundations of precious stones," "twelve gates of pearls, and at the gates twelve angels," and the names of "the twelve tribes of Israel" written thereupon, and wherein was "the tree of life," with its "twelve manner of fruits," which were "yielded every month" (Revelation 21:12, Revelation 21:14, Revelation 21:16, Revelation 21:19, Revelation 21:21; Revelation 22:2).