Theodoret of Cyrus
What is the significance of the statement ‘rtsyte: klas’? Theodoret, instead of using the term στάχυς (spike), interprets it as σύνθημα (military password). Following these events, when individuals attempted to deceive by claiming allegiance to different tribes, he ordered that a specific word be spoken, one that would expose their identity through their pronunciation. Just as the Osroenes, Syrians, and Phoenicians residing near the Euphrates and in Palestine may all communicate in the Syrian language, their accents vary significantly. Similarly, the Hebrews were composed of twelve tribes, each of which, including the tribe of Ephraim, likely possessed unique linguistic traits.
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For instance, while a Syrian may refer to a spike as eemvla, the Ephraimites had their own distinctive pronunciation as eemvelo. Aware of this, Jephthah instructed that this particular word be articulated, leading to the death of those who were thereby identified.