Numbers 3:38

The Message

Moses and Aaron and his sons camped to the east of The Dwelling, toward the rising sun, in front of the Tent of Meeting. They were in charge of maintaining the Sanctuary for the People of Israel and the rituals of worship. Anyone else who tried to perform these duties was to be put to death.

Cross References

1 Chronicles 23:32

In short, the Levites, with the sons of Aaron as their companions in the ministry of holy worship, were responsible for everything that had to do with worship: the place and times and ordering of worship.

Numbers 2:3

To the east toward the sunrise are the companies of the camp of Judah under its flag, led by Nahshon son of Amminadab. His troops number 74,600.