וְנָסַ֧ע אֹֽהֶל־מוֹעֵ֛ד מַחֲנֵ֥ה הַלְוִיִּ֖ם בְּת֣וֹךְ הַֽמַּחֲנֹ֑ת כַּאֲשֶׁ֤ר יַחֲנוּ֙ כֵּ֣ן יִסָּ֔עוּ אִ֥ישׁ עַל־יָד֖וֹ לְדִגְלֵיהֶֽם׃ (ס)
會幕，就是利未人的營，要在各營中間起行；他們怎樣紮營，就要怎樣起行，各人在自己的位置上，按著他們的旗號。
Rashi
ונסע אהל מועד AND THE TENT OF MEETING SHALL SET FORWARD after these two divisions (those of Judah and Reuben), as is shown by the position of this statement in the narrative.
Rashbam
בתוך המחנות, two flags (six tribes) would journey at the head followed by the parts of the Tabernacle and the Levites. These were followed by the last two flags (six tribes, there being a total of 4 flags.)
Sforno
ונסע...אהל מועד...בתוך המחנה. Between the two flags which have already been mentioned.
Chizkuni
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כאשר יחנו כן יסעו AS THEY ENCAMP SO SHALL THEY JOURNEY — just as I have explained (v. 9): their positions when marching shall be the same as when encamping — each division marches on that side that is assigned to it.
Rashbam
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על ידו means, in his place. The term יד does not even in this sense lose its original meaning, viz., that of “hand’’ — the area at one’s side is termed על ידו “that which is by his hand”, being that which is closest to him, and always within the reach of his hand (and not beyond it); en son aise in O. F.