Numbers 3:6

“But you shall appoint the Levites over the tabernacle of the testimony and over all its furnishings and over all that belongs to it. They shall carry the tabernacle and all its furnishings, and they shall attend to it; they shall also camp around the tabernacle.

is it not enough for you that the God of Israel has separated you from the rest of the congregation of Israel, to bring you near to Himself, to perform the service of the tabernacle of Yahweh, and to stand before the congregation to minister to them;

“But bring near with you also your brothers, the tribe of Levi, the tribe of your father, that they may be joined with you and minister to you, while you and your sons with you are before the tent of the testimony.

At that time Yahweh set apart the tribe of Levi to carry the ark of the covenant of Yahweh, to stand before Yahweh to minister for Him and to bless in His name to this day.

Thus they shall keep responsibility of the tent of meeting, and responsibility of the holy place, and responsibility of the sons of Aaron their relatives, for the service of the house of Yahweh.

“My sons, do not be at ease now, for Yahweh has chosen you to stand before Him, to minister to Him, and to be His ministers and offer offerings up in smoke.”

Then they appointed the priests to their sections and the Levites in their divisions for the service of God in Jerusalem, as it is written in the book of Moses.

and the Levitical priests shall not have a man cut off from before Me who is to offer burnt offerings, to offer up grain offerings in smoke, and to perform sacrifices continually.’”

“Yet they shall be ministers in My sanctuary, having oversight at the gates of the house and ministering in the house; they shall slaughter the burnt offering and the sacrifice for the people, and they shall stand before them to minister to them.