Numbers 1:52-56

And the children of Israel shall pitch their tents, every man by his own camp, and every man by his own standard, throughout their hosts.

But the Levites shall pitch round about the tabernacle of testimony, that there be no wrath upon the congregation of the children of Israel: and the Levites shall keep the charge of the tabernacle of testimony.

And the children of Israel did according to all that the LORD commanded Moses, so did they.