Numbers 18:16

And their redemption price, from a month old you shall redeem, according to your valuation, for the [fixed] price of five shekels in silver, in accordance with the shekel of the sanctuary, which is twenty gerahs.

Exodus 30:13

This is what everyone who is counted shall give [as he joins those already counted]: a half shekel, according to the sanctuary shekel (the shekel is twenty gerahs); a half shekel as a contribution to the Lord.

Numbers 3:47

you shall take five shekels apiece, per head, you shall take them in terms of the sanctuary shekel (the shekel is twenty gerahs),

Leviticus 27:2-7

“Speak to the children of Israel and say to them, ‘When a man makes a special vow [consecrating himself or a member of his family], he shall be valued according to your [established system of] valuation of people belonging to the Lord [that is, the priest accepts from the man making the vow a specified amount of money for the temple treasury in place of the actual person].

Leviticus 27:25

Every valuation of yours shall be in accordance with the sanctuary shekel; twenty gerahs shall make a shekel.

Ezekiel 45:12

The shekel shall be twenty gerahs; twenty shekels, twenty-five shekels, and fifteen shekels [added together, a total of sixty] shall be your maneh (mina).

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

According

Numbers 3:47
you shall take five shekels apiece, per head, you shall take them in terms of the sanctuary shekel (the shekel is twenty gerahs),
Leviticus 27:2
“Speak to the children of Israel and say to them, ‘When a man makes a special vow [consecrating himself or a member of his family], he shall be valued according to your [established system of] valuation of people belonging to the Lord [that is, the priest accepts from the man making the vow a specified amount of money for the temple treasury in place of the actual person].

Which is

Exodus 30:13
This is what everyone who is counted shall give [as he joins those already counted]: a half shekel, according to the sanctuary shekel (the shekel is twenty gerahs); a half shekel as a contribution to the Lord.
Leviticus 27:25
Every valuation of yours shall be in accordance with the sanctuary shekel; twenty gerahs shall make a shekel.
Ezekiel 45:12
The shekel shall be twenty gerahs; twenty shekels, twenty-five shekels, and fifteen shekels [added together, a total of sixty] shall be your maneh (mina).

General references

Numbers 3:15
“Number the sons of Levi by their fathers’ households, by their families (clans). You shall number every male from a month old and upward.”