Judges 11:37-39

New Century Version

³⁷ She also said, “But let me do one thing. Let me be alone for two months to go to the mountains. Since I will never marry, let me and my friends go and cry together.”

³⁸ Jephthah said, “Go.” So he sent her away for two months. She and her friends stayed in the mountains and cried for her because she would never marry. ³⁹ After two months she returned to her father, and Jephthah did to her what he had promised. Jephthah’s daughter never had a husband.

From this came a custom in Israel that