Numbers Chapter 3 Webster's Bible
And Nadab and Abihu died before the LORD, when they offered strange fire before the LORD, in the wilderness of Sinai, and they had no children: and Eleazar and Ithamar ministered in the priest's office in the sight of Aaron their father.
And I, behold, I have taken the Levites from among the children of Israel, instead of all the first-born that openeth the matrix among the children of Israel: therefore the Levites shall be mine;
Because all the first-born are mine; for on the day that I smote all the first-born in the land of Egypt, I hallowed to me all the first-born in Israel, both man and beast: mine they shall be: I am the LORD.
And the charge of the sons of Gershon in the tabernacle of the congregation shall be the tabernacle, and the tent, its covering, and the hanging for the door of the tabernacle of the congregation,
And of Kohath was the family of the Amramites, and the family of the Izharites, and the family of the Hebronites, and the family of the Uzzielites: these are the families of the Kohathites.
And their charge shall be the ark, and the table, and the candlestick, and the altars, and the vessels of the sanctuary with which they minister, and the hanging, and all the service of it.
And under the custody and charge of the sons of Merari shall be the boards of the tabernacle, and its bars, and its pillars, and its sockets, and all its vessels, and all that serveth to it.
But those that encamp before the tabernacle towards the east, even before the tabernacle of the congregation eastward shall be Moses and Aaron, and his sons, keeping the charge of the sanctuary, for the charge of the children of Israel; and the stranger that cometh nigh shall be put to death.
All that were numbered of the Levites, whom Moses and Aaron numbered at the commandment of the LORD, throughout their families, all the males from a month old and upward, were twenty and two thousand.
And thou shalt take the Levites for me (I am the LORD) 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.