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What is the definition of the words "La'avod" and "l'Masa", respectively?
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Seforno: "La'avod" refers to what they were in charge of whilst they were encamped; "l'Masa", what they were in charge of when they traveled.
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Seforno: In fact, the Torah is teaching us here, that whatever the Bnei Gershon were in charge of when they encamped