29 The Spirit of the Lord came upon Jephthah and he vowed a vow to the Lord, saying,
30-31 If you deliver the Ammonites into my hands, I will sacrifice to you as a burnt offering whatever comes out of my house to meet me when I return from battle.
32 Jephthah went to fight the Ammonites, and God delivered them into his hands.
33 And Jephthah smote twenty Ammonite cities with a very great slaughter.
Jephthah sacrifices his daughter to God (as a burnt offering)
34 When Jephthah came home, his daughter came out to meet him with timbrels and dances. She was his only child.
35 When Jephthah saw her, he tore his clothes, and said,
Jephthah did what he promised God he would do. (11:39)
Although apologists like to put the blame for this atrocity on Jephthah, he is praised in the New Testament, without any qualification, in Hebrews 11:32.