'Stronghold' in the Bible

and build an altar to the Lord your God on top of this mountain stronghold [with stones laid down] in an orderly way. Then take the second bull and offer a burnt sacrifice using the wood of the Asherah which you shall cut down.”

When all the leaders of the Tower of Shechem heard about it, they entered the inner chamber (stronghold) of the temple of El-berith (the god of a covenant).

So everyone of the people also cut down his branch and followed Abimelech, and they put the branches on top of the inner chamber and set it on fire over those inside, so that all the people in the Tower of Shechem also died, about a thousand men and women.