Parashas Bamidbar · Passuk 2:17
Then, midway between the divisions, the Tent of Meeting, the division of the Levites, shall move. As they camp, so they shall march, each in position, by their standards.
Chabad.org — English translation + Rashi
Source: Bamidbar Rabbah 2:9.
English: “And the Tent of Meeting shall journey” — \ldots when the meat goes outside the camp.
In context: Further units on the same passuk address the boundaries of the camp for sacrificial meat and related purity rules during travel.
Custom
Chazal continue the discussion of camp boundaries and the status of sacrificial meat while the nation is on the move.