Judges 12:6 in the King James Version
Then said they unto him, Say 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.
Context
5 The Gileadites took the fords of the Jordan against the Ephraimites. Whenever a fugitive of Ephraim said, “Let me go over,” the men of Gilead said to him, “Are you an Ephraimite?” If he said, “No;”
6 then they said to him, “Now say ‘Shibboleth;’” and he said “Sibboleth”; for he couldn’t manage to pronounce it correctly, then they seized him and killed him at the fords of the Jordan. At that time, forty-two thousand of Ephraim fell.
7 Jephthah judged Israel six years. Then Jephthah the Gileadite died, and was buried in the cities of Gilead.