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Fausset's Bible Dictionary
("dry, dried up".) The designation of the northern part of the Sinaitic range, so Rephidim is made to be situated in it (Exodus 17:6). Sinai was the central mass of mountains including the particular peak from which the law was given. So the name "Sinai" is most used from Exodus 19:11 to Numbers 3:1, where Israel is described as at or about the scene of the giving of the law. But, in Deuteronomy, where Israel appears no longer in that region, "Horeb" is used. Sinai means "sharp pointed," "toothed" (Knobel), the point Ras Sufsafeh. (See ; SINAI.)
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Fausset, Andrew R. Entry for 'Horeb'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/h/horeb.html. 1949.