They led out in the music and singing before the Tabernacle, the Tent of Meeting, until Solomon built the Lord's Temple in Jerusalem. They served following the regulations they had been given.
Tie the sashes around Aaron and his sons and put headdresses on them. The priesthood belongs to them forever. This is how you are to ordain Aaron and his sons.
When it's time to move the Tabernacle, the Levites shall take it down, and when it's time to make camp, the Levites shall put it up. Any outsider who goes near it must be put to death.
following the instructions given to him from the Lord through Moses. This was to remind the Israelites that no one who is not a descendant of Aaron should come and offer incense before the Lord, otherwise they could end up like Korah and those with him.
They will take care of your responsibilities and those relating to the Tent, but they must not come too close to the sacred objects of the sanctuary or the altar, otherwise they will die, and you will too.
But only you and your sons are responsible for your priesthood, doing all that concerns the altar and is behind the veil. Only you are to perform that service. I am giving you the gift of your priesthood, but anyone else who approaches the sanctuary must be executed.”
The camp of Moses, Aaron, and Aaron's sons was to the east of the Tabernacle, in the direction of the sunrise, in front of the Tent of Meeting. They were responsible for the sanctuary on behalf of the Israelites. Anyone else who tried to act as a priest was to be executed.
But God killed some of the people of Beth-shemesh because they looked inside the Ark of the Lord. He killed seventy, and the people mourned deeply because the Lord had killed so many.