Thematic Bible: Of the firstborn

And for those that are to be redeemed of the two hundred and seventy-three of the first-born of the sons of Israel, who are more than the Levites, you shall even take five shekels each by the head, according to the shekel of the sanctuary you shall take. (The shekel is twenty gerahs.) And you shall give to Aaron, and to his sons, the silver of the redeemed left over among them. read more.
And Moses took the redemption silver from those who were over and above the ones who were redeemed by the Levites. He took the silver from the first-born of the sons of Israel: one thousand three hundred and sixty-five shekels, according to the shekel of the sanctuary. And Moses gave the silver from those who were redeemed to Aaron and to his sons, according to the word of Jehovah, as Jehovah commanded Moses.

Everything that opens the womb in all flesh, which they bring to Jehovah, of men or animals, shall be yours. Nevertheless, the first-born of man you shall surely redeem, and the first-born of unclean animals you shall redeem. And those that are to be redeemed from a month old you shall redeem, according to your judgment for the silver of five shekels, according to the shekel of the sanctuary, which is twenty gerahs.