Numbers 3:47

you shall take five shekels per head ; you shall take them according to the shekel of the sanctuary (the shekel of twenty gerahs ),

collect five shekels for each one, according to the sanctuary shekel, which weighs twenty gerahs.

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 :)