1
וגם אחיך. בְּנֵי גֵרְשׁוֹן וּבְנֵי מְרָרִי: וגם את אחיך AND ALSO THY BRETHREN — i.e. the sons of Gershon and the sons of Merari.
2
וילוו. וְיִתְחַבְּרוּ אֲלֵיכֶם, לְהַזְהִיר גַּם אֶת הַזָּרִים מִלִּקְרַב אֲלֵיהֶם: וילוו means THAT THEY MAY JOIN THEMSELVES UNTO THEE to warn also the strangers (the ordinary Israelites) not to come near to them.
3
וישרתוך. בִּשְׁמִירַת הַשְּׁעָרִים וּלְמַנּוֹת מֵהֶם גִּזְבָּרִין וַאֲמַרְכָּלִין (ספרי): וישרתוך AND THEY SHALL MINISTER UNTO THEE by guarding the Temple gates and by appointing from among them (cf. Arakhin 11b) keepers of the Temple treasury and superintendents over these (Sifrei Bamidbar 116:1).