Bamidbar 2:17

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. 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. 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.

וְנָסַ֧ע אֹֽהֶל־מוֹעֵ֛ד מַחֲנֵ֥ה הַלְוִיִּ֖ם בְּת֣וֹךְ הַֽמַּחֲנֹ֑ת כַּאֲשֶׁ֤ר יַחֲנוּ֙ כֵּ֣ן יִסָּ֔עוּ אִ֥ישׁ עַל־יָד֖וֹ לְדִגְלֵיהֶֽם׃ {ס}        

Then the Tent of Meeting shall set forward with the camp of the Levites in the midst of the camps: as they encamp, so shall they set forward, every man in his place by their standards.