Numbers 3:40-43

GOD spoke to Moses: “Count all the firstborn males of the People of Israel who are one month and older. List their names. Then set apart for me the Levites—remember, I am GOD—in place of all the firstborn among the People of Israel, also the livestock of the Levites in place of their livestock. I am GOD.” So, just as GOD commanded him, Moses counted all the firstborn of the People of Israel. The total of firstborn males one month and older, listed by name, numbered 22,273.