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Fausset's Bible Dictionary
JAHAZA (Joshua 13:18), JAHAZAH (Joshua 21:36), JAHZAH (Numbers 21:23; Deuteronomy 2:32; Judges 11:20; Isaiah 15:4; Jeremiah 48:21; Jeremiah 48:34). Here the battle was fought wherein Israel overcame Sibon and so won his whole territory between the Arnon and the Jabbok. Jahaza was assigned to Reuben, then to the Merarite Levites (1 Chronicles 6:78; Joshua 21:36). It was in the plain country, now the Belka, in the extreme S. of Sihon's land but N. of the Arnon. Doubtless the battle was fought along the slope of the hill still called Shihan. There is on it a network of cyclopean walls, whence the slings and arrows of Israel dislodged the Amorites according to Josephus. Thence the enemy fled two miles to the edge of the Arnon gorge.
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Fausset, Andrew R. Entry for 'Jahaz'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/j/jahaz.html. 1949.