Thematic Bible: Of the firstborn

And the price you have to give for the two hundred and seventy-three first sons of the children of Israel which are in addition to the number of the Levites, Will be five shekels for every one, by the scale of the holy place (the shekel is twenty gerahs); And this money, the price of those over the number of the Levites, is to be given to Aaron and his sons. read more.
So Moses took the money, the price of those whose place had not been taken by the Levites; From the first sons of Israel he took it, a thousand, three hundred and sixty-five shekels, by the scale of the holy place; And he gave the money to Aaron and his sons, as the Lord had said.

The first birth of every living thing which is offered to the Lord, of man or beast, is to be yours; but for the first sons of man payment is to be made, and for the first young of unclean beasts. Payment is to be made for these when they are a month old, at the value fixed by you, a price of five shekels by the scale of the holy place, that is, twenty gerahs to the shekel.