Jamieson, Fausset and Brown on Jeremiah 32:7

7. son of Shallum thine uncle--therefore, Jeremiah's first cousin.

field ... in Anathoth--a sacerdotal city: and so having one thousand cubits of suburban fields outside the wall attached to it (Nu 35:4, 5). The prohibition to sell these suburban fields (Le 25:34) applied merely to their alienating them from Levites to another tribe; so that this chapter does not contravene that prohibition. Besides, what is here meant is only the purchase of the use of the field till the year of jubilee. On the failure of the owner, the next of kin had the right of redeeming it (Le 25:25, &c.; Ru 4:3-6).