Deuteronomy 10:8

“Bring the tribe of Levi near and have them stand before Aaron the priest, that they may minister to him.

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;

“For Yahweh your God has chosen him and his sons from all your tribes, to stand to minister in the name of Yahweh all the days.

So Moses wrote this law and gave it to the priests, the sons of Levi who carried the ark of the covenant of Yahweh, and to all the elders of Israel.

And David said, “No one is to carry the ark of God but the Levites; for Yahweh chose them to carry the ark of God and to minister to Him forever.”

“Also, the Levites will no longer need to carry the tabernacle and all its furnishings for its service.”

A Song of Ascents. Behold, bless Yahweh, all you slaves of Yahweh, Who stand in the house of Yahweh by night!