God sent an evil spirit1 between Abimelech and the citizens of Shechem, who acted treacherously against Abimelech.
References for Judges 9:23
God did this in order that the crime against Jerub-Baal's seventy sons,2 the shedding3 of their blood, might be avenged4 on their brother Abimelech and on the citizens of Shechem, who had helped him5 murder his brothers.
References for Judges 9:24
In opposition to him these citizens of Shechem set men on the hilltops to ambush and rob everyone who passed by, and this was reported to Abimelech.