Numbers 3:46-51

46There are 273 more firstborn sons of Israel than there are Levites. To redeem these extra firstborn sons,

47collect five pieces of silver for each of them (each piece weighing the same as the sanctuary shekel, which equals twenty gerahs).

48Give the silver to Aaron and his sons as the redemption price for the extra firstborn sons.”

49So Moses collected the silver for redeeming the firstborn sons of Israel who exceeded the number of Levites.

50He collected 1,365 pieces of silver on behalf of these firstborn sons of Israel (each piece weighing the same as the sanctuary shekel).

51And Moses gave the silver for the redemption to Aaron and his sons, just as the Lord had commanded.