Judges 12:5-6

5The Gileadites captured the fords of the Jordan leading to Ephraim. Whenever a fugitive from Ephraim said, “Let me cross over,” the Gileadites asked him, “Are you an Ephraimite?” If he answered, “No,”

6they told him, “Please say Shibboleth.” If he said, “Sibboleth,” because he could not pronounce it correctly, they seized him and executed him at the fords of the Jordan. At that time forty-two thousand from Ephraim died.