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Fausset's Bible Dictionary
("a stream" or "ear of grain".) The Ephraimites, unable to pronounce the aspirate (as indeed the Greeks also have no "sh" sound), said Sibboleth, and so were detected by the Gileadites under Jephthah at the passage of Jordan (Judges 12:6).
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Fausset, Andrew R. Entry for 'Shibboleth'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/s/shibboleth.html. 1949.