Exodus 30:13

30:13 Everyone who crosses over to those who are numbered is to pay this: a half shekel according to the shekel of the sanctuary (a shekel weighs twenty gerahs). The half shekel is to be an offering to the Lord.

Exodus 38:26

38:26 one beka per person, that is, a half shekel, according to the sanctuary shekel, for everyone who crossed over to those numbered, from twenty years old or older, 603,550 in all.