( Jeremiah 2:22 ; Malachi 3:2 ; Heb. borith), properly a vegetable alkali, obtained from the ashes of certain plants, particularly the salsola kali (saltwort), which abounds on the shores of the Dead Sea and of the Mediterranean. It does not appear that the Hebrews were acquainted with what is now called "soap," which is a compound of alkaline carbonates with oleaginous matter. The word "purely" in Isaiah 1:25 (RSV, "throughly;" marg., "as with lye") is lit. "as with bor ." This word means "clearness," and hence also that which makes clear, or pure, alkali. "The ancients made use of alkali mingled with oil, instead of soap ( Job 9:30 ), and also in smelting metals, to make them melt and flow more readily and purely" (Gesenius).
M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition,
published by Thomas Nelson, 1897. Public Domain, copy freely.
[N] indicates this entry was also found in Nave's Topical Bible
[S] indicates this entry was also found in Smith's Bible Dictionary
Bibliography InformationEaston, Matthew George. "Entry for Soap". "Easton's Bible Dictionary".