Then Jephthah gathered together all the men of Gilead, and fought with Ephraim: and the men of Gilead smote Ephraim, because they said, Ye Gileadites are fugitives of Ephraim {d} among the Ephraimites, and among the Manassites.

(d) You ran from us, and chose Gilead, and now in respect to us you are nothing.

Wesley's Notes

12:4 Ye Gileadites - These words are a contemptuous expression of the Ephraimites concerning the Gileadites, whom they call fugitives of Ephraim; the word Ephraim being here taken largely, as it comprehends the other neighbouring tribes, of which Ephraim was the chief; and especially their brethren of Manasseh, who lived next to them, and were descended from the same father, Joseph. By Gileadites here they seem principally to mean the Manassites beyond Jordan, who dwelt in Gilead. And although other Gileadites were joined with them, yet they vent their passion against these; principally, because they envied them most; as having had a chief hand in the victory. These they opprobriously call fugitives, that is, such as had deserted their brethren of Ephraim and Manasseh, planted themselves beyond Jordan, at a distance from their brethren, and were alienated in affection from them.

Jamieson-Fausset-Brown Bible Commentary

Jud 12:4-15. Discerned by the Word Sibboleth, Are Slain by the Gileadites.

4-6. the men of Gilead smote Ephraim, because they said, Ye Gileadites are fugitives of Ephraim-The remonstrances of Jephthah, though reasonable and temperate, were not only ineffectual, but followed by insulting sneers that the Gileadites were reckoned both by the western Manassites and Ephraimites as outcasts-the scum and refuse of their common stock. This was addressed to a peculiarly sensitive people. A feud immediately ensued. The Gileadites, determined to chastise this public affront, gave them battle; and having defeated the Ephraimites, they chased their foul-mouthed but cowardly assailants out of the territory. Then rushing to the fords of the Jordan, they intercepted and slew every fugitive. The method adopted for discovering an Ephraimite was by the pronunciation of a word naturally suggested by the place where they stood. Shibboleth, means "a stream"; Sibboleth, "a burden." The Eastern tribe had, it seems, a dialectical provincialism in the sound of Shibboleth; and the Ephraimites could not bring their organs to pronounce it.

Matthew Henry's Concise Commentary

12:1-7 The Ephraimites had the same quarrel with Jephthah as with Gideon. Pride was at the bottom of the quarrel; only by that comes contention. It is ill to fasten names of reproach upon persons or countries, as is common, especially upon those under outward disadvantages. It often occasions quarrels that prove of ill consequence, as it did here. No contentions are so bitter as those between brethren or rivals for honour. What need we have to watch and pray against evil tempers! May the Lord incline all his people to follow after things which make for peace!