Commentaire sur Les Nombres 11:30

ויאסף משה AND MOSES [AND THE ELDERS OF ISRAEL] RETIRED from the entrance of the appointed tent.

ויאסף משה אל המחנה הוא וזקני ישראל, “Moses then reentered the camp, he and the elders of Israel.” He went with the elders to accord them honour. The disaster did not strike until each one had returned to his tent.

From the entrance to the Tent of Meeting. Since the implication of ויאסף ([Moshe] entered) implies that he was outside the camp. Therefore Rashi needed to explain “from the entrance to the Tent of Meeting” which was the camp of the Divine Presence and consequently outside Moshe’s camp — the camp of the Levites.