What does the Bible say about Abimelech and his actions?

The account of Abimelech in Judges 9 serves as a stark warning against the consequences of sin and ambition detached from God’s authority. After seizing power, Abimelech killed his seventy brothers in a ruthless act of treachery to establish himself as king. His story highlights that true leadership and kingship come from God, and usurping God's ordained order leads to inevitable judgment, which, as we see, was pronounced through his violent demise at the hands of a woman in a walled city.