וְאֵ֣ת הֶֽעָרִ֗ים אֲשֶׁ֤ר תִּתְּנוּ֙ לַלְוִיִּ֔ם אֵ֚ת שֵׁשׁ־עָרֵ֣י הַמִּקְלָ֔ט אֲשֶׁ֣ר תִּתְּנ֔וּ לָנֻ֥ס שָׁ֖מָּה הָרֹצֵ֑חַ וַעֲלֵיהֶ֣ם תִּתְּנ֔וּ אַרְבָּעִ֥ים וּשְׁתַּ֖יִם עִֽיר׃
你們分給利未人的城中,要有六座避難城,是你們設立讓殺人者可以逃到那裡去的;此外,你們還要再分給他們四十二座城。
Or HaChaim
ואת הערים…את שש ערי המקלט, "and the cities…the six cities of refuge, etc." From this verse we learn that these six cities were to serve primarily the involuntary murderers who had to be exiled there and not the Levites. Seeing that in verse 7 the Torah mentions that the grand total of the number of cities allocated to the Levites is 48, it is clear that the Levites were also entitled to live in the six cities of refuge. Apparently, the Torah wrote matters in such a way that we understand that the Levites and the inadvertent murderers (Israelites) had equal rights in the six cities of refuge. This is why the Torah stressed the rights of the inadvertent murderers in the first verse whereas in the second verse it appears to stress the rights of the Levites. From all this it is clear that the exiles do not have the right to charge rent to the Levites. All the opinions discussing this subject in Makkot 13 are agreed on this point. I may add that it is my view that in the event that there is a surfeit of exiles in any of the six cities of refuge, a Levite may be forced to leave in order to make room for an inadvertent murderer.
Rabbeinu Bahya
ועליהם תתנו ארבעים ושתים עיר, “In addition to them (the 6 cities designated for involuntary manslaughterers to take refuge) you will add another 42 cities for the Levites.” This would make a total of 48 cities in which the Levites would dwell. Three of the cities of refuge were to be situated in the territories of the two and a half tribes on the east bank of the Jordan, the remaining three in Eretz Yisrael proper.
Chizkuni
ועליהם תתנו ארבעים ושתים עיר, “and in addition you will add 42 towns” (which can also serve as cities of refuge). The difference between the six cities of refuge named and the cities of the Levites is that the former serve as such regardless of if the unintentional killer is aware of their function or not, whereas the 42 cities of the Levites serve as such only if specifically chosen by the unintentional killer for that purpose. Talmud tractate Makkot, folio 10.