Matthew Poole and continuators on Numbers 35:3

3 And the cities shall they have to dwell in, and the suburbs of them shall be for their cattel , and for their goods, and for all their beasts.

For pasturage for their cattel: where they might not build houses, nor plant gardens, orchards or vineyards, no nor sow corn, for which they were abundantly provided out of the firstfruits and tithes. And these suburbs did not belong to the Levites in common, but were distributed to them in convenient proportions, as may appear from Ios. 21. 18. 1 Chron. 6. 60.