The relative values of the persons appear to be regulated according to an estimate of the probable value of their future work:

As regards the…

And if it be a female ... thirty shekels. —As the woman is the weaker vessel, and her labour is of less value, if she vow…

And if it [be] a female
That is, of the same age, full twenty years of age, and not more than sixty:

…

Zeal for the service of God inclined the Israelites, on some occasions, to dedicate themselves or their children to the service of the Lord, in his…