Numbers 30:2-4

Living Bible

30 ^1-2 Now Moses summoned the leaders of the tribes and told them, “The Lord has commanded that when anyone makes a promise to the Lord, either to do something or to quit doing something, that vow must not be broken: the person making the vow must do exactly as he has promised.

³ “If a woman promises the Lord to do or not do something, and she is still a girl at home in her father’s home, ⁴ and her father hears that she has made a vow with penalties, but says nothing, then her vow shall stand.