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Smith's Bible Dictionary
Reins. (that is, kidneys). In the ancient system of physiology, the kidneys were believed to be the seat of desire and longing, which accounts for their often being coupled, with the heart. Psalms 7:9; Psalms 26:2; Jeremiah 11:20; Jeremiah 17:10, etc.
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Smith, William, Dr. Entry for 'Reins'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/r/reins.html. 1901.