Numbers 35:3 - Joseph Benson’s Commentary on the Old and New Testaments

The cities shall they have to dwell in Notwithstanding this provision, it was lawful for them to hire or purchase houses in any other city, particularly at Jerusalem; for we find in Scripture many proofs of their dwelling in other cities besides those which are here assigned them; and, in like manner, other people, with their permission, might dwell with them in their cities. The suburbs for their cattle and for their goods For stables and pasturage for their cattle, and stowages for their household stuff of all kinds. But they might not build houses, nor plant gardens, orchards, or vineyards; no, nor sow corn in these suburbs, for which things they were abundantly supplied from the first-fruits. And these suburbs did not belong to the Levites in common, but were distributed to them in convenient proportions. They were thus provided for, that they might the more closely attend to the study of the law, and might have more leisure for teaching the people. And living thus near together, they could easily converse one with another about divine things, to their mutual edification; in doubtful cases could consult each other; and in all cases strengthen one another's hands.