"Gilead then cut Ephraim off from the fords of the Jordan, and whenever a fugitive from Ephraim said, 'Let me cross over,' the Gileadites asked him, 'Are you an Ephraimite?'" (Judges 12:5)
The Ephraimites come to Jephthah angry: why did you go to fight the Ammonites without calling us? They threaten to burn his house. Jephthah defends himself: I called you but you did not help. He fights Ephraim and defeats them. Gilead then cut Ephraim off from the fords of the Jordan, and whenever a fugitive from Ephraim said, 'Let me cross over,' the Gileadites asked him, 'Are you an Ephraimite?' If he said no, they told him to say Shibboleth. If he said Sibboleth, because he could not pronounce it correctly, they killed him. Forty-two thousand Ephraimites died. The word Shibboleth has passed into every language as the term for any test that identifies the insider from the outsider by linguistic or cultural markers.
The civil war within Israel triggered by Ephraim's complaint about not being included in the victory is the self-destructive tendency of the Judges period: the energy that should be directed outward against oppressors is turned inward against fellow Israelites. The Catechism warns against the division within the covenant community that gives the enemy more power than any external threat (CCC 817).
Brothers and sisters, forty-two thousand Israelites died in a civil war about who deserved credit for a victory. The Shibboleth test became a death sentence. Every community that uses its shared language and culture as a weapon against its own members has learned from the worst of Judges. Your pronunciation test for insiders and outsiders is costing people their lives.
Lord God, the Shibboleth war killed more Israelites than the Ammonites had. Deliver your Church from internal conflicts that destroy those we should be protecting. Give us the unity that makes every internal test obsolete. Through Christ our Lord. Amen.