Shibboleth

And the Gileadites took the passages of Jordan before the Ephraimites; and it was so, that when those Ephraimites which were escaped said, Let us go over; that the men of Gilead said unto him, Art thou an Ephraimite? If he said, Nay; Then said they unto him, Sag now Shibboleth: and he said Sibboleth: for he could not frame to pronounce it right. Then they took him, and slew him at the passages of Jordan; and there fell at that time of the Ephraimites forty and two thousand.  And the Gileadites...