John Gill Commentary Judges 9:47

"And it was told Abimelech that all the men of the tower of Shechem were gathered together." — Judges 9:47 (ASV)

And it was told Abimelech
Who had his spies about, and particularly to observe the motions of the men in this tower:

that all the men of the tower of Shechem were gathered together ;
in the hold of the temple of Baalberith.