'Redemption' in the Bible

As the redemption price for the 273 firstborn Israelites who outnumber the Levites,

Give the money to Aaron and his sons as the redemption price for those who are in excess among the Israelites.”

And Moses took the redemption money of them that were over and above them that were redeemed by the Levites:

He gave the redemption money to Aaron and his sons in obedience to the Lord, just as the Lord commanded Moses.

You will pay the redemption price for a month-old male according to your assessment: five shekels of silver by the standard sanctuary shekel, which is 20 gerahs.