Leviticus 27:4 - Ellicott's Commentary On The Whole Bible

And if it be a female... thirty shekels. — As the woman is the weaker vessel, and her labour is of less value, if she vows herself or dedicates by a vow any other one of her own sex to the sanctuary, she is to pay thirty shekels, or £3 17s. 6d., provided she is within the above-named limits of age. This was the value of a slave (Exodus 21:32), and is the price at which Christ was sold (Matthew 27:9). It is supposed that under this provision Jephtha might have redeemed his daughter whom he unwittingly vowed to the Lord (Judges 11:30). (See, however, Leviticus 27:29.)