a[See ver. 5 above]

Judges 12:6

6they said to him, “Then say Shibboleth,” and he said, “Sibboleth,” for he could not pronounce it right. Then they seized him and slaughtered him at athe fords of the Jordan. At that time 42,000 of the Ephraimites fell.

Nehemiah 13:24

24And half of their children spoke the language of Ashdod, and they could not speak the language of Judah, but only the language of each people.
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