Numbers 3
40 Ref And Jehovah said unto 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.
41 Ref And thou shalt take the Levites for me (I am Jehovah) instead of all the first-born among the children of Israel; and the cattle of the Levites instead of all the firstlings among the cattle of the children of Israel:
42 and Moses numbered, as Jehovah commanded him, all the first-born among the children of Israel.
43 Ref And all the first-born males according to the number of names, from a month old and upward, of those that were numbered of them, were twenty and two thousand two hundred and threescore and thirteen.