The meaning of Door-posts in the Bible
(From Easton's Bible Dictionary)

The Jews were commanded to write the divine name on the posts (mezuzoth') of their doors (Deuteronomy 6:9). The Jews, misunderstanding this injunction, adopted the custom of writing on a slip of parchment these verses (Deuteronomy 6:4-9, and 11:13-21), which they enclosed in a reed or cylinder and fixed on the right-hand door-post of every room in the house.

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