Judges 12:4-6

Young's Literal Translation

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.