(Ibid. "then I shall make for you a place [even now, in the desert,] where he shall flee":) We did not hear (where that place is.) It follows (by identity) A (temporary) "refuge" (in the desert) is spoken of, and a permanent "refuge" (i.e., the cities of the Levites) is spoken of. Just as the latter is in the cities of the Levites, so, the former is in the camp of the Levites.
Then I Shall Make for You a Place [Even Now
Mekhilta Tractate Nezikin 4:15