The meaning of Prison in the Bible
(From Easton's Bible Dictionary)
The first occasion on which we read of a prison is in the history of Joseph in Egypt. Then Potiphar, "Joseph's master, took him, and put him into the prison, a place where the king's prisoners were bound" (Genesis 39:20-23). The Heb. word here used (sohar) means properly a round tower or fortress. It seems to have been a part of Potiphar's house, a place in which state prisoners were kept.
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