Numbers 3:23
The tents of the Gershonites are to be placed at the back of the House, to the west.
Numbers 1:53
But the tents of the Levites are to be round the Tent of meeting, so that wrath may not come on the children of Israel: the Tent of meeting is to be in the care of the Levites.
Numbers 2:17
Then the Tent of meeting is to go forward, with the tents of the Levites, in the middle of the armies; in the same order as their tents are placed, they are to go forward, every man under his flag.
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