Judges 12:4-6 Amplified Bible, Classic Edition (AMPC)
4 Then Jephthah gathered all the men of Gilead and fought with Ephraim; and the men of Gilead smote Ephraim because they had said, You Gileadites are fugitives of Ephraim in the midst of Ephraim and Manasseh.
5 And the Gileadites took the fords of the Jordan before the Ephraimites; and when any of those Ephraimites who had escaped said, Let me go over, the men of Gilead said to him, Are you an Ephraimite? If he said, No,
6 They said to him, Then say Shibboleth; and he said, Sibboleth, for he could not pronounce it right. Then they seized him and slew him at the fords of the Jordan. And there fell at that time 42,000 of the Ephraimites.
Judges 12:4-6 New International Version (NIV)
4 Jephthah then called together the men of Gilead and fought against Ephraim. The Gileadites struck them down because the Ephraimites had said, “You Gileadites are renegades from Ephraim and Manasseh.” 5 The Gileadites captured the fords of the Jordan leading to Ephraim, and whenever a survivor of Ephraim said, “Let me cross over,” the men of Gilead asked him, “Are you an Ephraimite?” If he replied, “No,” 6 they said, “All right, say ‘Shibboleth.’” If he said, “Sibboleth,” because he could not pronounce the word correctly, they seized him and killed him at the fords of the Jordan. Forty-two thousand Ephraimites were killed at that time.