Jephthah vowed a vow. — This was a practice among all ancient nations, but specially among the Jews (Genesis 28:20-22; 1 Samuel 1:11; 2 Samuel 15:8; Psalms 66:13).
Related Commentaries of Judges 11:30
Judges 11:30
30 And Jephthah vowed a vow unto the LORD, and said, If thou shalt without fail deliver the children of Ammon into mine hands,