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Fausset's Bible Dictionary
borit . (See .) Jeremiah 2:22. Vegetable alkali or potash. Many plants yielding alkalies exist in Palestine and around: hubeibet (Salsola kali ) with glass-like leaves near the Dead Sea; ajram near Sinai, pounded for use as soap; the gilloo or soap plant of Egypt; and the heaths near Joppa. The Saponaria offcinalis and Μesembryanthemum nodiflorum . (Job 9:30; Isaiah 1:25). Hebrew for "purely" "as alkali (purifies)."
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Fausset, Andrew R. Entry for 'Soap'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/s/soap.html. 1949.