“Take the Levites instead of all the firstborn among the children of Israel, and the cattle of the Levites instead of their cattle; and the Levites shall be mine: I am the LORD.”
King James Version (KJV)
3:46 For those that are to be redeemed - 'Tis probable, in the exchange they began with the eldest of the first - born, and so downwards, so that those were to be redeemed, who were the two hundred, seventy three youngest of them.
3:47 Five shekels - Which was the price paid for the redemption of a first - born a month old.