Judges 11:9 - Ellicott's Commentary On The Whole Bible

Shall I be your head? — We must not be surprised if Jephthah does not display a disinterested patriotism. He was only half an Israelite; he had been wronged by his father’s kin; he had spent long years of his manhood among heathens and outlaws, who gained their livelihood by brigandage or mercenary warfare. “As Gideon is the highest pitch of greatness to which this period reaches,” says Dean Stanley. “Jephthah and Samson are the lowest points to which it descends.” Since, then, we have marked elements of ferocity and religious ignorance and ambition even in the noble character of Gideon, we must remember that we might naturally make allowance for a still lower level of attainment in one who had been so unfavourably circumstanced as Jephthah. Apart from the Syrian influences which had told upon him, the whole condition of the pastoral tribes on the east of the Jordan was far below that of the agricultural western tribes.