Thematic Bible: Of the firstborn

And for those that are to be redeemed of the two hundred and threescore and thirteen of the firstborn of the children of Israel, who are more than the Levites; You shall even take five shekels apiece individually, after the shekel of the sanctuary shall you take them: (the shekel is twenty gerahs:) And you shall give the money, with which the excess number of them is to be redeemed, unto Aaron and to his sons. read more.
And Moses took the redemption money of them that were over and above them that were redeemed by the Levites: Of the firstborn of the children of Israel took he the money; a thousand three hundred and threescore and five shekels, according to the shekel of the sanctuary: And Moses gave the money of them that were redeemed unto Aaron and to his sons, according to the word of the LORD, as the LORD commanded Moses.

Every thing that opens the womb in all flesh, which they bring unto the LORD, whether it be of men or animals, shall be yours: nevertheless the firstborn of man shall you surely redeem, and the firstling of unclean animals shall you redeem. And those that are to be redeemed from a month old shall you redeem, according to your valuation, for the money of five shekels, according to the shekel of the sanctuary, which is twenty gerahs.