Smith's Bible Dictionary
Gob. (cistern). A place mentioned only in 2 Samuel 21:18-19, as the scene of two encounters between David's warriors and the Philistines. In the parallel account in 1 Chronicles 20:4, the name is given as Gezer.
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Smith, William, Dr. Entry for 'ob'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/o/ob.html. 1901.