Numbers 3:10 (NLT)
Appoint Aaron and his sons to carry out the duties of the priesthood. But any unauthorised person who goes too near the sanctuary must be put to death.
11And the LORD said to Moses,
12“Look, I have chosen the Levites from among the Israelites to serve as substitutes for all the firstborn sons of the people of Israel. The Levites belong to me,
13 for all the firstborn males are mine. On the day I struck down all the firstborn sons of the Egyptians, I set apart for myself all the firstborn in Israel, both of people and of animals. They are mine; I am the LORD.”
Numbers 3:20 (NLT) - 20 The clans descended from Merari were named after two of his descendants, Mahli and Mushi.These were the Levite clans, listed according to their family groups.
Numbers 3:25 (NLT)
These two clans were responsible to care for the Tabernacle, including the sacred tent with its layers of coverings, the curtain at its entrance,
Numbers 3:26 (NLT)
the curtains of the courtyard that surrounded the Tabernacle and altar, the curtain at the courtyard entrance, the ropes, and all the equipment related to their use.