Numbers 3:45-51

45“Take the Levites in place of all the firstborn of Israel, and the livestock of the Levites in place of their livestock. The Levites are to be mine. I am the LORD . 46To redeem the 273 firstborn Israelites who exceed the number of the Levites, 47collect five shekels That is, about 2 ounces or about 58 grams for each one, according to the sanctuary shekel, which weighs twenty gerahs.

48Give the money for the redemption of the additional Israelites to Aaron and his sons.” 49So Moses collected the redemption money from those who exceeded the number redeemed by the Levites. 50From the firstborn of the Israelites he collected silver weighing 1,365 shekels, That is, about 35 pounds or about 16 kilograms according to the sanctuary shekel. 51Moses gave the redemption money to Aaron and his sons, as he was commanded by the word of the LORD .