judges 11:34 And Jephthah came to Mizpeh unto his house, and, behold, his daughter came out to meet him with timbrels and with dances: and she was his only child; beside her he had neither son nor daughter. - Free Bible Online

      34-40. Jephthah came to Mizpeh unto his house, and, behold, his daughter came out to meet him with timbrels and with dances--The return of the victors was hailed, as usual, by the joyous acclaim of a female band (1Sa 18:6), the leader of whom was Jephthah's daughter. The vow was full in his mind, and it is evident that it had not been communicated to anyone, otherwise precautions would doubtless have been taken to place another object at his door. The shriek, and other accompaniments of irrepressible grief, seem to indicate that her life was to be forfeited as a sacrifice; the nature of the sacrifice (which was abhorrent to the character of God) and distance from the tabernacle does not suffice to overturn this view, which the language and whole strain of the narrative plainly support; and although the lapse of two months might be supposed to have afforded time for reflection, and a better sense of his duty, there is but too much reason to conclude that he was impelled to the fulfilment by the dictates of a pious but unenlightened conscience.

JFB.