Numbers 3:44-51

44And the Lord spoke to Moses, saying, 45 aTake the Levites instead of all the firstborn among the people of Israel, and the cattle of the Levites instead of their cattle. The Levites shall be mine: I am the Lord. 46And bas the redemption price for the 273 of the firstborn of the people of Israel, over and above the number of the male Levites, 47you shall take cfive shekels
A  shekel was about 2/5 ounce or 11 grams
per head; you shall take them according to ethe shekel of the sanctuary (the shekel of twenty gerahs
A  gerah was about 1/50 ounce or 0.6 gram
),
48and give the money to Aaron and his sons as the redemption price for those who are over.” 49So Moses took the redemption money from those who were over and above those redeemed by the Levites. 50From the firstborn of the people of Israel he took the money, g1,365 shekels, by the shekel of the sanctuary. 51And Moses hgave the redemption money to Aaron and his sons, according to the word of the Lord, as the Lord commanded Moses.

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