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Fausset's Bible Dictionary
Isaiah 37:12. THELASAR, 2 Kings 19:12. "Hill (or sanctuary) of Asshur"; a place wrested from the children of Eden by Assyria. Somewhere in western Mesopotamia; associated with Gozan, Haran, and Rezeph, in the hill country above the upper Mesopotamian plain, from which rises the river Khabour. The targum on Genesis 10:12 understands Tellssar to be Resen.
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Fausset, Andrew R. Entry for 'Tellssar'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/t/tellssar.html. 1949.