Judges 12:4-6 Young's Literal Translation (YLT)
4 And Jephthah gathered all the men of Gilead, and fighteth with Ephraim, and the men of Gilead smite Ephraim, because they said, `Fugitives of Ephraim [are] ye Gileadites, in the midst of Ephraim -- in the midst of Manasseh.'
5 And Gilead captureth the passages of the Jordan to Ephraim, and it hath been, when [any of] the fugitives of Ephraim say, `Let me pass over,' and the men of Gilead say to him, `An Ephramite thou?' and he saith, `No;'
6 that they say to him, `Say, I pray thee, Shibboleth;' and he saith, `Sibboleth,' and is not prepared to speak right -- and they seize him, and slaughter him at the passages of the Jordan, and there fall at that time, of Ephraim, forty and two chiefs.
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.