Albert Barnes Commentary Judges 9:46

"And when all the men of the tower of Shechem heard thereof, they entered into the stronghold of the house of Elberith." — Judges 9:46 (ASV)

An hold of the house of the god Berith - As combining the advantages of a “sanctuary” (compare 1 Kings 2:28) and a fortress. The word rendered “hold” occurs elsewhere only in (1 Samuel 13:6), where it is rendered “high-place.” Its exact signification is uncertain.