The notice of yarn is contained in an extremely obscure passage in (1 Kings 10:28; 2 Chronicles 1:16) The Hebrew Received Text is questionable. Gesenius gives the sense of "number" as applying equally to the merchants and the horses: "A band of the king’s merchants bought a drove (of horses) at a price."
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Bibliography Information Smith, William, Dr. "Entry for 'Yarn'". "Smith's Bible Dictionary". <http://classic.studylight.org/dic/sbd/view.cgi?number=T4486>. 1901.