Judges 12:6 ICB

[6] they would say to him, "Say the word 'Shibboleth.'" The men of Ephraim could not say that word correctly. They pronounced it "Sibboleth." If the man from Ephraim said, "Sibboleth," the men of Gilead would kill him at the crossing place. So 42,000 men from Ephraim were killed at that time.