This section continues the discussion from 3:21–37 about the duties of the three Levite clans. The Levites carried and cared for the Tent of Meeting while traveling and camping. Other tribes always surrounded them to protect them and their valuable cargo (2:17). They placed the holy items of God in the center of the tribes. The priests and their Levitical assistants kept these items holy by separating them.
God, in his holiness, deserves to have the details of his will given careful attention. The Tent of Meeting and its furnishings were holy. The tribe of Levi had to maintain the difference between holy and common, and between ceremonially clean and unclean. This is why there is so much information about the duties of the three Levite clans.