So the lords of Shechem set ambushes against him on the mountaintops. They robbed all who passed by them along that way, and it was reported to Abimelech.
This happened so that the violence done to the seventy sons of Jerubbaal might be avenged and their blood be laid on their brother Abimelech, who killed them, and on the lords of Shechem, who strengthened his hands to kill his brothers.