Judges 9:23

(23) An evil spirit.—Whether the word used for spirit (ruach) is here meant to be personal or not we cannot say. Sometimes it seems to mean an evil being (1 Samuel 16:14), sometimes only an evil temper (Numbers 14:24). The later Jews would have made little or no difference between the two, since they attributed almost every evil to the direct agency of demons.

Dealt treacherously.—The word is used for the beginning of a defection.