Judges 9:22-25

22Abimelech ruled over Israel for three years.

23Then God sent an evil spirit between Abimelech and the leaders of Shechem; and the leaders of Shechem acted treacherously against Abimelech,

24so that the violence done to the seventy sons of Jerubbaal (Gideon) might come [on the guilty], and that their [innocent] blood might be laid on Abimelech their brother, who had killed them, and on the leaders of Shechem, who strengthened his hands (encouraged him) to kill his brothers.

25The leaders of Shechem set men in ambush against Abimelech on the mountaintops, and they robbed all who passed by them along the road; and it was reported to Abimelech.