Albert Barnes' Notes on the Whole Bible - Judges 9:1
We are not told how soon after the death of Gideon these events happened. There must have been time for the apostacy and establishment of Baal-worship, and for the development of ill-will between Abimelech and his brethren. read more
Adam Clarke's Commentary on the Bible - Judges 9:5
Slew his brethren - His brothers by the father's side, Judges 8:30 . This was a usual way of securing an ill-gotten throne; the person who had no right destroying all those that had right, that he might have no competitors. Yet Jotham - was left - That is, all the seventy were killed except Jotham, if there were not seventy besides Jotham. All the histories of all the nations of the earth are full of cruelties similar to those of Abimelech: cousins, uncles, brothers,... read more