Judges 11:40 in the King James Version
That the daughters of Israel went yearly to lament the daughter of Jephthah the Gileadite four days in a year.
Context
39 At the end of two months, she returned to her father, who did with her according to his vow which he had vowed. She was a virgin. It became a custom in Israel
40 that the daughters of Israel went yearly to celebrate the daughter of Jephthah the Gileadite four days in a year.