Judges 12:5-6
Young’s Literal Translation

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 (שבלת);’ and he saith, `Sibboleth,’ (סבלת) 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.