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Smith's Bible Dictionary
Raca. A term of reproach derived from the Chaldee, reka, worthless. ("Raca denotes a certain looseness of life and manners, while 'fool', in the same passage, means a downright wicked and reprobate person."). Matthew 5:22.
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Smith, William, Dr. Entry for 'Raca'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/r/raca.html. 1901.