Thematic Bible: Of the firstborn

And for those that are to be ransomed, the two hundred and seventy-three of the firstborn of the children of Israel, which are in excess over the Levites, thou shalt take five shekels apiece by the poll, according to the shekel of the sanctuary shalt thou take them, twenty gerahs the shekel; and thou shalt give the money unto Aaron and unto his sons for those in excess among them who are to be ransomed. read more.
And Moses took the ransom-money from them that were over and above those who were ransomed by the Levites; of the firstborn of the children of Israel he took the money, a thousand three hundred and sixty-five shekels, according to the shekel of the sanctuary. And Moses gave the money of them that were ransomed to Aaron and to his sons, according to the commandment of Jehovah, as Jehovah had commanded Moses.

Everything that breaketh open the womb of all flesh, which they present to Jehovah, of men or of beasts, shall be thine; nevertheless the firstborn of man shalt thou in any case ransom, and the firstborn of unclean beasts shalt thou ransom. And those that are to be ransomed from a month old shalt thou ransom, according to thy valuation, for the money of five shekels, after the shekel of the sanctuary, which is twenty gerahs.