Leviticus 27:3
“And thy estimation shall be of the male from twenty years old even unto sixty years old, even thy estimation shall be fifty shekels of silver, after the shekel of the sanctuary.”
And the Lord spake unto Moses, saying,
Speak unto the children of Israel, and say unto them, When a man shall make a singular vow, the persons shall be for the Lord by thy estimation.
And thy estimation shall be of the male from twenty years old even unto sixty years old, even thy estimation shall be fifty shekels of silver, after the shekel of the sanctuary.
And if it be a female, then thy estimation shall be thirty shekels.
And if it be from five years old even unto twenty years old, then thy estimation shall be of the male twenty shekels, and for the female ten shekels.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“This they shall give, every one that passeth among them that are numbered, half a shekel after the shekel of the sanctuary: (a shekel is twenty gerahs:) an half shekel shall be the offering of the Lord.”
“Thou shalt even take five shekels apiece by the poll, after the shekel of the sanctuary shalt thou take them: (the shekel is twenty gerahs:)”
“And those that are to be redeemed from a month old shalt thou redeem, according to thine estimation, for the money of five shekels, after the shekel of the sanctuary, which is twenty gerahs.”
“And he shall bring his trespass offering unto the Lord, a ram without blemish out of the flock, with thy estimation, for a trespass offering, unto the priest:”
“And when a man shall sanctify his house to be holy unto the Lord, then the priest shall estimate it, whether it be good or bad: as the priest shall estimate it, so shall it stand.”