'Fortress' in the Bible

I have set thee among my people as an assayer, a fortress, that thou mayest know and try their way.

Gather up thy baggage out of the land, O inhabitress of the fortress.

Jehovah, my strength and my fortress, and my refuge in the day of distress, unto thee shall the nations come from the ends of the earth, and they shall say, Surely our fathers have inherited falsehood and vanity; and in these things there is no profit.