The account referred to can be found in Judges 11:30-31, 34-40. We read:
“And Jephthah made a vow to the LORD, and said, ‘If You will indeed deliver the people of Ammon into my hands, then it will be that whatever comes out of the doors of my house to meet me, when I return in peace from the people of Ammon, shall surely be the LORD’s, and I will offer it up as a burnt offering.’… When Jephthah came to his house at Mizpah [after having defeated the Ammonites], there was his daughter, coming out to meet him with timbrels and dancing; and she was his only child. Besides her he had neither son nor daughter. And it came to pass, when he saw her, that he tore his clothes, and said, ‘Alas, my daughter! You have brought me very low! You are among those who trouble me! For I have given my word to the LORD, and I cannot go back on it.’ So she said to him, ‘My father, if you have given your word to the LORD, do to me according to what has gone out of your mouth… let me alone for two months, that I… bewail my virginity…’ And it was so at the end of two months that she returned to her father, and he carried out his vow with her which he had vowed. She knew no man. And it became a custom in Israel that the daughters of Israel went four days each year to lament the daughter of Jephthah the Gileadite.”
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