Num Numbers, chapter Book of Numbers, chapter 3

youi shall even take five shekels apiece by the poll, after the shekel of the sanctuary shall youi take [them] (the shekel [is] twenty gerahs)Num 18:16; Exo 30:13

And youi shall give the money, which the over and above (what is left over) of them is to be redeemed, unto Aharon [Bright, Very High] and to his sons.