Judges 11:3

Of Tob — The name either of the land, or of the man who was the owner or ruler of it. This place was in, or near Gilead, as appears by the speedy intercourse which here was between Jephthah and the Israelites. Vain men — Idle persons, who desired rather to get their living by spoil and rapine, than by honest labour. These evil persons Jephthah managed well, employing them against the enemies of God, and of Israel, that bordered upon them; and particularly upon parties of the Ammonites, which made the Israelites more forward to chuse him for their chieftain in this war. Went out — When he made excursions and attempts upon the enemy.