Were erected not only in the outer walls and on the heights within cities, Judges 9:47-49 Psalm 48:12 Luke 13:4 , but along the frontiers of a country, at points where the approach of an enemy could be descried at a distance, Judges 9:17 Isaiah 21:6-9 Ezekiel 33:2-6 . A tower afforded a refuge to the surrounding inhabitants, in case of invasion; and often, when most of a city was subdued, the tower or citadel remained impregnable.
So God is a strong and safe protector of his people, Psalm 18:2 61:8 Proverbs 18:10 . A slight tower or look-out was often erected for the keeper of a vineyard or flock, 2 Chronicles 26:10 Isaiah 5:2 Micah 4:8 Matthew 21:33; and travelers in Palestine see them in use at this day.
Although written in 1859 by William Rand, this dictionary of the Bible from the American Tract Society is still relevant today.Wikipedia
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