Matthew Poole and continuators on Jeremiah 32:7

7 Behold Hanameel the son of Shallum thine uncle, shall come unto thee, saying, Buy thee my field that is in Anathoth , for the right of redemption is thine to buy it .

From hence may be concluded the certainty of future contingency in Gods eye, the coming of Hanameel, was a future contingency, yet certainly known to God, so as he could tell the Prophet he would come.

Anathoth (as appears from Ioh. 21.18.) was one of the Cities of the Levites; hence ariseth a question, how it could be sold to Ieremiah, who by the Law might not possess it, Numb. 18.20. being a Levite. Some excuse it from the command of God, who might dispense with his own Law, but this seemeth not enough, because it is said afterward, The right of Redemption is thine. 2. Others therefore say the Levites might have some small possessions, though no plowed land: They might have Houses, and Orchards, and Gardens, in Cities and Suburbs. But that these might be sold seemeth contrary to the Law, Levit. 25.34. It is therefore rather thought to be meant of some small estate lest to Hanameel from his Ancestors.

The right of Redemption belonged to the next of Kin, Lev. 25.25. Ruth 4.4.