What does "Nesunim lo" mean?
Rashi: It means that they are charged to assist Aharon in the Avodah. 1
Seforno: Refer to 3:9:2:2.
See Sifsei Chachamim.
Why does the Torah repeat the word "Nesunim"?
Rashbam: It is simply a double expression (perhaps for emphasis), in the way that the Torah sometimes does.
Seforno: It teaches us that all the Avodah of the Levi'im was according to the instructions of Aharon and his sons, and nobody else.
What are the implications of Me'eis Bnei Yisrael?