'Walls' in the Bible

All these towns had high walls round them with doors and locks; and in addition we took a great number of unwalled towns.

Give ear, O Israel: today you are to go over Jordan, to take the heritage of nations greater and stronger than yourselves, and towns of great size with walls as high as heaven;

At the end of every three years take a tenth part of all your increase for that year, and put it in store inside your walls:

Only those trees which you are certain are not used for food may be cut down and put to destruction: and you are to make walls of attack against the town till it is taken.

Your towns will be shut in by his armies, till your high walls, in which you put your faith, have come down: his armies will be round your towns, through all your land which the Lord your God has given you.