וַיֹּאמְרוּ֩ זִקְנֵ֨י גִלְעָ֜ד אֶל־יִפְתָּ֗ח לָכֵן֙ עַתָּה֙ שַׁ֣בְנוּ אֵלֶ֔יךָ וְהָלַכְתָּ֣ עִמָּ֔נוּ וְנִלְחַמְתָּ֖ בִּבְנֵ֣י עַמּ֑וֹן וְהָיִ֤יתָ לָּ֙נוּ֙ לְרֹ֔אשׁ לְכֹ֖ל יֹשְׁבֵ֥י גִלְעָֽד׃
And the elders of Gilead said unto Jephthah: ‘Therefore are we returned to thee now, that thou mayest go with us, and fight with the children of Ammon, and thou shalt be our head over all the inhabitants of Gilead.’
Read halakhic rulings (Jewish law) on Judges 11:8: and classical halakhic sources.