Judges 11:39
“And it came to pass at the end of two months, that she returned unto her father, who did with her according to his vow which he had vowed: and she knew no man. And it was a custom in Israel,”
And she said unto her father, Let this thing be done for me: let me alone two months, that I may go up and down upon the mountains, and bewail my virginity, I and my fellows.
And he said, Go. And he sent her away for two months: and she went with her companions, and bewailed her virginity upon the mountains.
And it came to pass at the end of two months, that she returned unto her father, who did with her according to his vow which he had vowed: and she knew no man. And it was a custom in Israel,
That the daughters of Israel went yearly to lament the daughter of Jephthah the Gileadite four days in a year.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“And the king was sorry: nevertheless for the oath’s sake, and them which sat with him at meat, he commanded it to be given her.”
“Speak unto the children of Israel, and say unto them, When a man shall make a singular vow, the persons shall be for the Lord by thy estimation.”
“If a man vow a vow unto the Lord, or swear an oath to bind his soul with a bond; he shall not break his word, he shall do according to all that proceedeth out of his mouth.”
“Therefore also I have lent him to the Lord; as long as he liveth he shall be lent to the Lord. And he worshipped the Lord there.”
“And when she had weaned him, she took him up with her, with three bullocks, and one ephah of flour, and a bottle of wine, and brought him unto the house of the Lord in Shiloh: and the child was young.”