Commentaries:
Jamieson, Fausset, and Brown
he took—rather "he had taken." This statement is accounting for his acquisition of so large a territory; he got it by right of conquest from the former possessors.
Kenath—This place, along with its group of surrounding villages, was gained by Nobah, one of Jair's officers sent by him to capture it (Numbers 32:1-2).
All these belonged to the sons of Machir—In their number Jair is included as having completely identified himself by his marriage and residence in Gilead with the tribe of Manasseh.
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