Numbers 30:3

If a woman also vow a vow unto the Lord, and bind herself by a bond, being in her father’s house in her youth;

Cross-reference

Numbers 30:2 gives the general rule for vows; this verse introduces a specific exception for a young woman under her father's authority.

In 1 Samuel 1:11, Hannah's vow exemplifies a woman's vow that her husband accepted, showing this law in practice.