You shall present the Levites before the Tent of Meeting, and you shall assemble the whole Israelite congregation.
And assemble all the congregation at the door of the Tent of Meeting.
You shall bring Aaron and his sons to the door of the Tent of Meeting and wash them with water. [John 17:17-19.]
And they set the priests in their divisions and the Levites in their courses for the service of God at Jerusalem, as it is written in the Book of Moses.