The short fibers of the flax plant.
Now there were men lying in wait, abiding with her in the chamber. And she said unto him, the Philistines be upon thee, Samson. And he brake the withs, as a thread of TOW is broken when it toucheth the fire. So his strength was not known. ( Judges 16:9 )
The coarser part of flax, with short threads, used as an example of easily inflammable material. Also Isaiah 43:17 the King James Version for pishtah, the usual word for "flax" (so the English Revised Version), here as used for a wick (so the American Standard Revised Version, the English Revised Version margin).
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