(20) Let fire come out.--The malediction is that they may perish by mutual destruction. It was exactly fulfilled (Judges 9:45-49). So when (?etes is crucified as he had crucified Polykrates, Herodotus notices the similarity of the Nemesis (3:128).

9:7-21 There was no occasion for the trees to choose a king, they are all the trees of the Lord which he has planted. Nor was there any occasion for Israel to set a king over them, for the Lord was their King. Those who bear fruit for the public good, are justly respected and honoured by all that are wise, more than those who merely make a figure. All these fruit-trees gave much the same reason for their refusal to be promoted over the trees; or, as the margin reads it, to go up and down for the trees. To rule, involves a man in a great deal both of toil and care. Those who are preferred to public trust and power, must forego all private interests and advantages, for the good of others. And those advanced to honour and dignity, are in great danger of losing their fruitfulness. For which reason, they that desire to do good, are afraid of being too great. Jotham compares Abimelech to the bramble or thistle, a worthless plant, whose end is to be burned. Such a one was Abimelech.But if not,.... If it appeared that they had not acted uprightly and sincerely in this matter:

let fire come out of Abimelech, and devour the men of Shechem, and the house of Millo; let wrath, rage, and fury, break out from Abimelech like fire, and issue in the destruction of those that made him king, both those of Shechem and of Millo:

and let fire come out from the men of Shechem, and from the house of Millo, and devour Abimelech; let them be incensed against Abimelech, and seek his ruin, and procure it: the sense is, that he wishes that strife, contention, and quarrels, might arise among them, and they mutually destroy each other; the words are imprecative of evil upon them both, and which had its exact fulfilment.