Numbers 3:40-48

40And Jehovah said to Moses, Number all the first-born males of the children of Israel from a month old and upward, and take the number of their names.

41And thou shalt take the Levites for me (I am Jehovah) instead of all the firstborn among the children of Israel; and the cattle of the Levites, instead of all the firstlings among the cattle of the children of Israel.

42And Moses numbered, as Jehovah had commanded him, all the firstborn among the children of Israel.

43And all the firstborn males, by the number of the names, from a month old and upward, according to their numbering, were twenty-two thousand two hundred and seventy-three.

44And Jehovah spoke to Moses, saying,

45Take 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 Jehovah.

46And for those that are to be ransomed, the two hundred and seventy-three of the firstborn of the children of Israel, which are in excess over the Levites,

47thou shalt take five shekels apiece by the poll, according to the shekel of the sanctuary shalt thou take them, — twenty gerahs the shekel;

48and thou shalt give the money unto Aaron and unto his sons for those in excess among them who are to be ransomed.