Judges 12:4-6

⁴Then Jephthah gathered all the men of Gilead and fought Ephraim; and the men of Gilead defeated Ephraim, because they said, “You are fugitives of Ephraim, O Gileadites, in the midst of Ephraim and in the midst of Manasseh.” ⁵The Gileadites captured the fords of the Jordan opposite Ephraim. And it happened when any of the fugitives of Ephraim said, “Let me cross over,” the men of Gilead would say to him, “Are you an Ephraimite?” If he said, “No,” ⁶then they would say to him, “Say now, ‘Shibboleth.’” But he said, “Sibboleth,” for he could not pronounce it correctly. Then they seized him and slew him at the fords of the Jordan. Thus there fell at that time 42,000 of Ephraim.